What Is a Cloud Service Provider? Types, Top Providers, and How to Choose One

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When people think of cloud service providers, names like Amazon Web Services (AWS), Microsoft Azure, and Google Cloud usually come to mind. But those companies represent only part of a much broader market.

Today, organizations use cloud providers for everything from hosting websites and storing data to running artificial intelligence (AI) workloads and managing Kubernetes clusters. Some providers offer hundreds of services across multiple continents, while others focus on a single specialty, such as graphics processing unit (GPU) computing or managed databases. Choosing the right provider depends on far more than brand recognition.

With so many vendors offering different services, pricing models, deployment options, and areas of expertise, it can be difficult to know which provider best fits your workload.

This guide explains what a cloud service provider is, the different types of cloud providers available today, the leading providers in 2026, and the key factors to consider before making a decision.

What is a cloud service provider?

A cloud service provider (CSP) is a company that delivers on-demand computing resources, such as virtual machines, storage, databases, networking, and other cloud services, over the internet. Instead of purchasing, managing, and maintaining physical infrastructure, customers rent these resources on a pay-as-you-go basis and scale them up or down as their needs change.

The core value of a cloud service provider is both technical and financial. Rather than investing in servers, networking equipment, and data centers as a capital expense, organizations pay only for the resources they consume as an operating expense. The provider owns and manages the underlying infrastructure, including the hardware, facilities, maintenance, and availability, while the customer focuses on deploying and operating applications.

You may also see the terms cloud provider and cloud computing provider used interchangeably with cloud service provider. Although the terminology varies, all three refer to companies that deliver cloud infrastructure and services. The specific capabilities they offer depend on their service models, deployment models, and areas of specialization, which we'll explore next.

Types of Cloud Service Providers

Cloud service providers can be categorized in two ways: by the services they provide and by how their infrastructure is deployed. Most comparisons focus on one category and overlook the other. Understanding both makes it easier to choose the right provider for your workload.

By service model

Infrastructure as a Service (IaaS) provides on-demand infrastructure resources, including virtual machines, storage, networking, and load balancers. You manage the operating system, runtime, middleware, and applications, while the provider manages the underlying physical infrastructure. A team running a custom Kubernetes cluster on rented virtual machines is using IaaS.

Platform as a Service (PaaS) provides a managed application platform on top of the underlying infrastructure. You focus on building and deploying applications, while the provider manages the operating system, runtime, patching, scaling, and much of the infrastructure required to run your code. A team deploying a Node.js application without provisioning or managing servers is using PaaS.

Software as a Service (SaaS) delivers a complete application over the internet. Users simply access the software through a web browser or client application, while the provider manages the infrastructure, platform, updates, security, and maintenance. Services such as Slack and Salesforce are examples of SaaS.

As you move from Infrastructure as a Service (IaaS) to Platform as a Service (PaaS) and Software as a Service (SaaS), the cloud service provider assumes responsibility for managing more of the underlying technology stack. This allows customers to focus less on infrastructure management and more on building applications and achieving business goals.

Two additional service models are also common:

  • Database as a Service (DBaaS): Provides fully managed databases without requiring customers to install or maintain database servers. The provider manages provisioning, backups, replication, patching, scaling, and infrastructure maintenance. Connecting an application to a managed PostgreSQL database instead of operating your own database server is an example of DBaaS.
  • Function as a Service (FaaS): Runs individual functions in response to events without requiring customers to provision or manage servers. Resources are allocated only while the function executes, making FaaS well suited for event-driven and serverless applications. Function as a Service (FaaS) is one category within the broader Anything as a Service (XaaS) model, which includes cloud-delivered services such as storage, databases, monitoring, and security.

By deployment model

Deployment models describe where cloud infrastructure runs and how it is managed and accessed.

  • Public cloud: Infrastructure owned and operated by a cloud service provider and delivered over the internet. Resources may be shared or dedicated depending on the service. Public cloud platforms are designed to provide on-demand scalability and global availability.
  • Private cloud: Infrastructure dedicated to a single organization. It may be hosted in the organization's own data center or managed by a third-party cloud service provider to provide greater control, customization, and compliance.
  • Hybrid cloud: Combines private and public cloud environments, allowing applications and data to move between them as business, performance, or regulatory requirements change.
  • Multi-cloud: Uses services from two or more cloud service providers. Organizations often adopt a multi-cloud strategy to reduce vendor lock-in, improve resilience, optimize costs, or take advantage of each provider's unique capabilities.

In practice, many organizations combine multiple deployment models and cloud service providers to meet different business, compliance, performance, and cost requirements. As the number of vendors grows, it becomes increasingly important to distinguish true cloud service providers from software products and platforms that simply run on cloud infrastructure. The next section explains how to tell the difference.

What qualifies as a cloud service provider?

A cloud service provider (CSP) delivers cloud infrastructure and computing services directly to customers. It is responsible for operating and managing the underlying infrastructure, regardless of whether it owns or leases the physical facilities. A tool or application that simply runs on a cloud provider's infrastructure is not itself a cloud service provider.

The confusion usually comes from the word cloud. Many software products are delivered through the cloud, but delivering software over cloud infrastructure is not the same as providing cloud infrastructure itself.

True cloud service providers deliver infrastructure directly to customers, allowing them to provision computing resources such as virtual machines, storage, databases, networking, and managed platforms on demand. Examples include:

  • Amazon Web Services (AWS)
  • Microsoft Azure
  • Google Cloud
  • Oracle Cloud Infrastructure (OCI)
  • IBM Cloud
  • Alibaba Cloud
  • DigitalOcean
  • Rackspace Spot

Several categories of products are often mistaken for cloud service providers because they're delivered over the cloud, even though they don't provide cloud infrastructure themselves:

  • Software as a Service (SaaS) applications. Microsoft OneDrive, Slack, and Dropbox are software applications delivered over cloud infrastructure rather than cloud service providers. They rely on one or more cloud providers to host and deliver their services.
  • Content delivery networks (CDNs). Companies such as Cloudflare primarily provide networking, security, and content delivery services. While many now offer additional compute and storage capabilities, they are not designed to serve as general-purpose cloud infrastructure providers in the same way as AWS, Microsoft Azure, or Google Cloud.
  • Managed service providers (MSPs) and software vendors. A managed service provider helps customers design, operate, monitor, and optimize existing cloud infrastructure, which may itself run on one or more cloud service providers. Unlike a cloud service provider, an MSP doesn't primarily deliver the underlying cloud infrastructure that customers consume directly.

Understanding this distinction makes it much easier to compare vendors. A software application solves a specific business problem, while a cloud service provider supplies the underlying infrastructure that applications run on. Once you know which companies qualify as cloud service providers, the next step is understanding the leading providers in today's market and how they compare.

Major cloud service providers in 2026

The cloud infrastructure market is led by three hyperscale providers, AWS, Microsoft Azure, and Google Cloud. Together, they account for roughly two-thirds of global cloud infrastructure spending, but the market extends well beyond these three companies. Regional providers and specialized cloud platforms continue to compete by focusing on cost, simplicity, performance, or specific workload types.

According to Synergy Research Group's Q1 2026 report, AWS holds approximately 28% to 30% of the global cloud infrastructure market, Microsoft Azure approximately 21% to 25%, and Google Cloud approximately 13% to 14%. Combined, they represent about 68% of worldwide cloud infrastructure spending.

Market share alone doesn't tell the full story. During the same period, Microsoft Azure grew approximately 40% year over year, Google Cloud approximately 63%, and Amazon Web Services approximately 19%. Although Amazon Web Services remains the market leader, Azure and Google Cloud continue to narrow the gap through faster growth.

The major cloud service providers each serve different customer needs:

  • Amazon Web Services (AWS): The largest cloud provider by infrastructure revenue, offering the broadest portfolio of compute, storage, databases, artificial intelligence (AI), networking, analytics, and Internet of Things (IoT) services across the widest global footprint.
  • Microsoft Azure: Popular among enterprises invested in the Microsoft ecosystem, with strong hybrid cloud capabilities and deep integration with Microsoft 365, Active Directory, and Azure Arc.
  • Google Cloud: Best known for data analytics, artificial intelligence (AI), and machine learning platforms, including BigQuery and Vertex AI, alongside a rapidly expanding global infrastructure.
  • IBM Cloud: Focuses on regulated industries and hybrid cloud deployments, particularly for financial services, healthcare, and government organizations.
  • Oracle Cloud Infrastructure (OCI): Optimized for Oracle database workloads and enterprise applications while competing aggressively on compute and networking costs.
  • Alibaba Cloud: The leading cloud provider in mainland China and a major player across Asia-Pacific, making it an important choice for organizations operating in those markets.
  • DigitalOcean: A developer-focused cloud platform that emphasizes simplicity, predictable pricing, and ease of use for startups and small businesses.
  • Rackspace Spot: A cloud infrastructure provider offering managed Kubernetes, virtual machines, managed PostgreSQL Database as a Service (DBaaS), networking, storage, and load balancing. Unlike traditional cloud providers that rely on fixed on-demand pricing, Rackspace Spot offers an auction-based marketplace for Spot instances, allowing customers to bid for spare compute capacity and optimize infrastructure costs for suitable workloads.

Although hyperscalers dominate the market, specialized providers often compete by optimizing for a specific use case rather than trying to match the breadth of Amazon Web Services, Microsoft Azure, or Google Cloud.

For example, Rackspace Spot's auction-based marketplace allows customers to bid for compute capacity instead of paying fixed on-demand prices. Because pricing reflects real-time supply and demand, workloads such as batch processing, continuous integration and continuous delivery (CI/CD) pipelines, distributed artificial intelligence (AI) training, and large-scale data processing can often run at significantly lower cost than on traditional on-demand instances.

Red Hat occupies a different position in the cloud ecosystem. Rather than operating a hyperscale cloud platform, it provides OpenShift and hybrid cloud technologies that run across multiple cloud providers and on-premises infrastructure. Its products complement cloud service providers rather than compete directly with them.

Understanding the strengths of the major cloud service providers is only the first step. The next question is whether using a cloud service provider is the right choice at all, and what advantages cloud infrastructure offers over running your own environment.

Benefits of using a cloud service provider

Using a cloud service provider changes how organizations consume computing resources, shifting both the financial model and the operational responsibilities of running infrastructure. Instead of investing in and maintaining physical hardware, organizations can provision resources on demand and scale them as business needs evolve.

The benefits are consistent across most cloud service providers, although the extent of each advantage depends on the provider and the workloads being deployed.

Cost efficiency. Cloud computing replaces large upfront infrastructure investments with a pay-as-you-go pricing model. Organizations pay only for the resources they consume, reducing the cost of maintaining underutilized hardware. Some providers also offer alternative pricing models to reduce costs further. For example, Rackspace Spot uses an auction-based marketplace that allows customers to bid for spare compute capacity, making it well suited for cost-sensitive workloads that can tolerate interruptions.

Scalability and elasticity. Cloud resources can scale up or down in response to changing demand. For example, an e-commerce application can automatically provision additional compute resources during seasonal shopping peaks and release them once traffic returns to normal, avoiding the cost of infrastructure sized only for peak demand.

Reliability and service level agreements (SLAs). Most cloud service providers offer uptime commitments backed by service level agreements (SLAs). These commitments are supported by redundant infrastructure, multiple availability zones, and geographically distributed regions designed to minimize service disruptions.

Global reach. Leading cloud providers operate data centers in multiple geographic regions, allowing organizations to deploy applications closer to their users. This helps reduce latency, improve application performance, and satisfy regional data residency requirements.

Security and compliance. Cloud providers invest heavily in physical security, encryption, identity and access management, threat detection, and regulatory compliance. While customers remain responsible for securing their own applications and data, providers handle much of the underlying infrastructure security.

Faster innovation. Cloud providers continuously introduce new services, including managed databases, artificial intelligence (AI) platforms, serverless computing, and analytics tools. Organizations can adopt these capabilities without purchasing new hardware or building the supporting infrastructure themselves.

These benefits explain why cloud computing has become the preferred deployment model for many organizations. However, they don't eliminate every challenge. Cost management, vendor lock-in, compliance, and operational complexity remain important considerations when choosing a cloud service provider.

Challenges and risks of using a cloud service provider

While cloud computing offers significant benefits, it also introduces challenges that organizations should consider before choosing a provider.

Vendor lock-in. Proprietary application programming interfaces (APIs), managed services, and provider-specific architectures can make migrating workloads to another cloud service provider expensive and time-consuming.

Service level agreements (SLAs). Modern applications often depend on multiple cloud services, each with its own service level agreement (SLA). Understanding how these guarantees interact is important because overall application availability depends on every component.

Hidden costs. Charges such as data egress, premium networking, and managed services can significantly increase cloud costs.

Shared responsibility. Cloud service providers secure the underlying infrastructure, while customers remain responsible for securing their applications, identities, configurations, and data. Misunderstanding this shared responsibility model is a common cause of cloud security incidents.

Cloud waste. It's easy to overprovision resources or leave unused workloads running, resulting in unnecessary cloud spending without proper monitoring and cost optimization.

Understanding these tradeoffs helps organizations choose the right cloud service provider and build secure, cost-effective cloud environments.

Security and the shared responsibility model

Cloud security follows a shared responsibility model, where the cloud service provider and the customer each have distinct security responsibilities. The exact boundary depends on the service model. Misunderstanding where that boundary lies is one of the most common causes of cloud security incidents.

Cloud service providers secure the underlying infrastructure, including physical data centers, hardware, networking, and the virtualization layer. Customers are responsible for securing everything they build on top of that infrastructure. As more services become managed, the provider assumes more responsibility.

Here's how security responsibilities differ across common service models:

Security responsibility by service model

Layer IaaS PaaS SaaS DBaaS
Physical infrastructure and hardware Provider Provider Provider Provider
Virtualization and host operating system Provider Provider Provider Provider
Runtime and middleware Customer Provider Provider Provider
Application code Customer Customer Provider Customer
Data and identity and access management Customer Customer Customer Customer
Database engine and maintenance Customer Provider* Not applicable Provider
Database users, permissions, and data Customer Customer Not applicable Customer

* Where applicable.


Regardless of the service model, customers remain responsible for protecting their data, managing identities and permissions, and configuring security correctly. As you move from Infrastructure as a Service (IaaS) to Platform as a Service (PaaS) and Software as a Service (SaaS), the provider manages more of the underlying technology stack, while the customer's operational responsibilities decrease.

Before choosing a cloud service provider, ask questions such as:

  • Which compliance certifications does the provider hold, such as General Data Protection Regulation (GDPR), Health Insurance Portability and Accountability Act (HIPAA), or Service Organization Control 2 (SOC 2)?
  • What encryption standards protect data at rest and in transit, and are they enabled by default?
  • What is the provider's incident response process, and how quickly are customers notified after a security incident?
  • Which data residency options are available, and can data be restricted to specific geographic regions?

Understanding the shared responsibility model is an important step toward choosing a secure cloud service provider. The next section explains how to apply these concepts when evaluating providers.

How to choose a cloud service provider

Choosing a cloud service provider means matching a provider's pricing model, capabilities, and operational requirements to your workload, rather than simply selecting the largest or most well-known platform. The following criteria can help you identify the provider that best fits your technical and business needs.

Cost and pricing transparency. Look beyond the advertised compute price. Licensing fees, data egress charges, managed services, and networking costs can significantly increase the total cost of ownership. If cost optimization is a priority, consider whether the provider offers alternative pricing models, such as reserved capacity, spot instances, or auction-based pricing.

Performance and reliability. Review the provider's service level agreements (SLAs), uptime history, and regional availability. Ensure the provider offers redundant availability zones and infrastructure in the locations where your applications will run.

Security and compliance. Verify that the provider supports the security standards and compliance certifications your organization requires, such as Service Organization Control 2 (SOC 2), International Organization for Standardization (ISO) 27001, Health Insurance Portability and Accountability Act (HIPAA), or General Data Protection Regulation (GDPR).

Scalability and elasticity. Evaluate how quickly resources can scale to meet changes in demand and whether scaling is automatic, granular, and cost-effective.

Service breadth and ecosystem compatibility. Confirm that the provider supports the databases, container platforms, programming languages, and continuous integration and continuous delivery (CI/CD) tools your team already uses. The best provider is one that integrates naturally with your existing workflows.

Multi-cloud and hybrid cloud support. If you plan to use multiple cloud providers or combine cloud and on-premises infrastructure, ensure the provider offers the networking, identity management, and interoperability features needed to support those environments.

Data residency and sovereignty. Confirm which geographic regions the provider operates in and whether it allows data to remain within specific jurisdictions to satisfy regulatory or contractual requirements.

Vendor lock-in. Consider how difficult it would be to migrate applications and data to another provider in the future. Heavy reliance on proprietary services can significantly increase switching costs.

Support and managed services. Compare support plans, response time commitments, and managed service offerings. Strong technical support can be just as important as the underlying infrastructure.

Innovation and roadmap. Choose a provider that continues to invest in the technologies your organization depends on, whether that's artificial intelligence (AI), managed Kubernetes, serverless computing, or high-performance graphics processing unit (GPU) infrastructure.

No single cloud service provider performs best across every category. Some organizations prioritize global reach and service breadth, while others focus on simplicity, regulatory compliance, or cost optimization. Evaluating providers against your specific workload requirements is the most reliable way to make the right choice.

Cloud service provider comparison table

The following table compares the major cloud service providers covered in this article, highlighting their market position, strengths, ideal use cases, and supported deployment models.

Cloud service provider comparison

Provider Market position Key strengths Best-fit use case Deployment model support
Amazon Web Services (AWS) Largest cloud infrastructure provider Broadest service catalog and widest global infrastructure footprint Organizations needing the broadest range of managed cloud services Public, Hybrid, Multi-cloud
Microsoft Azure Leading enterprise cloud platform Deep Microsoft ecosystem integration and hybrid cloud capabilities Organizations invested in Microsoft technologies Public, Private, Hybrid, Multi-cloud
Google Cloud Leading AI and analytics cloud provider BigQuery, Vertex AI, and advanced data analytics AI, machine learning, and data-intensive workloads Public, Hybrid, Multi-cloud
IBM Cloud Hybrid cloud specialist Enterprise security, compliance, and hybrid solutions Financial services, healthcare, and government Public, Private, Hybrid
Oracle Cloud Infrastructure (OCI) Enterprise infrastructure specialist Optimized for Oracle databases and enterprise applications Oracle database and ERP workloads Public, Hybrid
Alibaba Cloud Leading Asia-Pacific cloud provider Strong regional infrastructure and compliance capabilities Organizations operating in China and Southeast Asia Public, Hybrid
DigitalOcean Developer-focused cloud provider Simple pricing and easy-to-use platform Startups, developers, and small businesses Public
Rackspace Spot Specialized cloud infrastructure provider Managed Kubernetes, Spot instances, managed PostgreSQL DBaaS, storage, networking, and market-based Spot pricing Batch processing, AI training, CI/CD pipelines, and other fault-tolerant cloud-native workloads Public

No single provider is the best choice for every workload. The hyperscalers excel in global reach, managed services, and ecosystem breadth, while specialized providers compete by optimizing for simplicity, regional expertise, or cost.

For example, Rackspace Spot combines managed cloud infrastructure with an auction-based marketplace for Spot instances, allowing organizations to bid for spare compute capacity instead of paying fixed on-demand prices. This pricing model can significantly reduce compute costs for interruption-tolerant workloads, but it isn't intended for applications that require uninterrupted availability.

The comparison table provides a high-level overview, but selecting the right cloud service provider ultimately depends on your workload, technical requirements, compliance needs, and budget.

7 reasons to choose Rackspace Spot as your cloud provider

Choosing the right cloud provider depends on your workload, budget, and operational requirements. Rackspace Spot differentiates itself by combining managed Kubernetes, flexible infrastructure, and an auction-based pricing model that helps organizations optimize cloud costs.

  1. Managed Kubernetes with a free control plane. Rackspace Spot provides fully managed Kubernetes Cloudspaces with no additional control plane fee. Unlike some providers that charge separately for managed Kubernetes control planes, the cost is included, helping reduce the total cost of running Kubernetes clusters.
  2. Market-based pricing for Spot instances. Rackspace Spot's Spot instances use an open-market auction where pricing reflects real-time supply and demand. Bids start as low as $0.001 per hour, giving organizations greater control over compute costs for suitable workloads.
  3. Built for modern cloud-native platforms. Managed Kubernetes includes built-in autoscaling and supports both Calico and Cilium as Container Network Interface (CNI) options, allowing teams to choose the networking model that best fits their environment.
  4. Developer and GitOps friendly. Infrastructure can be managed through Terraform, the spotctl command-line interface (CLI), or the web dashboard, making it easy to integrate Rackspace Spot into existing infrastructure-as-code and GitOps workflows.
  5. Managed PostgreSQL Database as a Service (DBaaS). Rackspace Spot provides a fully managed PostgreSQL service, allowing teams to deploy production-ready databases without managing the underlying infrastructure.
  6. Predictable infrastructure pricing. Persistent storage and load balancers are offered with straightforward pricing, including flat-rate load balancers and multiple storage classes for different performance requirements, making infrastructure costs easier to estimate.
  7. Designed for production workloads. Features such as node pre-emption notifications for spot instance evictions, managed Kubernetes, and flexible deployment options help teams operate Spot workloads more reliably while maintaining visibility into infrastructure behavior.

Rackspace Spot offers a different approach from traditional hyperscalers by combining managed Kubernetes with flexible infrastructure and market-based pricing for Spot instances. Organizations evaluating cloud providers should compare its capabilities, pricing model, and operational features alongside other providers to determine the best fit for their workloads.

Common mistakes when evaluating a cloud service provider

Even experienced teams can overlook important factors when comparing cloud service providers. Avoid these common mistakes during your evaluation:

Choosing based only on brand recognition or price. The lowest advertised compute price doesn't always translate to the lowest total cost of ownership. Data egress, managed services, licensing, and support costs can quickly change the overall picture.

Ignoring data egress and networking costs. Moving data out of a provider's network is often significantly more expensive than moving it in. These costs can become substantial for migrations, backups, and multi-cloud architectures.

Misunderstanding the shared responsibility model. Cloud service providers secure the underlying infrastructure, but customers remain responsible for protecting their applications, identities, configurations, and data.

Overlooking compliance and data residency requirements. Verify that the provider supports the certifications, geographic regions, and data residency controls your organization requires before migrating workloads.

Comparing different types of cloud products. Software as a Service (SaaS) applications such as Slack or Dropbox solve business problems, while cloud service providers supply the infrastructure those applications run on. Comparing them directly leads to poor purchasing decisions.

The most common evaluation mistakes happen when organizations focus on a single factor, such as price or brand recognition, instead of considering how well a provider fits their technical, operational, and compliance requirements. The frequently asked questions below address some of the most common questions organizations ask before selecting a cloud service provider.

Conclusion

Choosing the right cloud service provider is about matching a provider's capabilities, pricing, and operational model to your workload, not simply choosing the biggest name.

Use the framework in this guide to compare costs, security, compliance, scalability, and vendor lock-in before making a decision. Many organizations ultimately adopt a multi-cloud strategy to optimize different workloads.

If cost optimization and managed Kubernetes are priorities, Rackspace Spot is worth evaluating alongside providers such as AWS, Microsoft Azure, and Google Cloud. The best cloud service provider is the one that best fits your technical and business requirements.

Frequently Asked Questions

What is a cloud service provider?

A cloud service provider (CSP) is a company that delivers computing resources, such as virtual machines, storage, databases, networking, and other cloud services, over the internet. Instead of purchasing and maintaining physical infrastructure, customers rent these resources on demand and pay only for what they use.

What are the major cloud service providers?

The largest cloud service providers by infrastructure spend are AWS, Microsoft Azure, and Google Cloud, which together account for roughly 68% of the global market. Other providers, including IBM Cloud, Oracle Cloud Infrastructure (OCI), Alibaba Cloud, DigitalOcean, and Rackspace Spot, compete by focusing on enterprise workloads, regional markets, developer simplicity, or cost optimization.

Which of the following is not a cloud service provider?

Applications such as Microsoft OneDrive, Slack, and Dropbox are not cloud service providers. They are Software as a Service (SaaS) applications that run on cloud infrastructure provided by companies such as Microsoft Azure or AWS. Similarly, content delivery networks (CDNs) and managed service providers (MSPs) complement cloud providers but are not cloud service providers themselves.

How do I choose a cloud service provider?

Choose a provider based on your workload requirements rather than brand recognition alone. Compare pricing models, performance, service level agreements (SLAs), security, compliance certifications, scalability, data residency, vendor lock-in, and support. If reducing compute costs is a priority, it's also worth evaluating providers such as Rackspace Spot, which offers auction-based pricing for Spot instances alongside managed Kubernetes.

What's the difference between Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS)?

Infrastructure as a Service (IaaS) provides virtual infrastructure that customers configure and manage themselves. Platform as a Service (PaaS) manages the underlying platform so developers can focus on building and deploying applications. Software as a Service (SaaS) delivers complete applications that users access without managing any infrastructure.

What are the main types of cloud service providers?

Cloud service providers are commonly categorized by the services they deliver. The three foundational service models are Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). Additional models, including Database as a Service (DBaaS) and Function as a Service (FaaS), have also become widely adopted.

Is Microsoft OneDrive a cloud service provider?

No. Microsoft OneDrive is a Software as a Service (SaaS) application built on Microsoft Azure. Microsoft Azure is the cloud service provider because it delivers the underlying infrastructure, while OneDrive is the application that customers use.

Who are the biggest cloud service providers in 2026?

Amazon Web Services (AWS) remains the largest cloud service provider by infrastructure spend, followed by Microsoft Azure and Google Cloud. Together they account for approximately two-thirds of the global cloud infrastructure market. Specialized providers such as Rackspace Spot compete by focusing on specific strengths, including managed Kubernetes and cost-optimized Spot compute, rather than offering the breadth of services available from the hyperscalers.

What is the shared responsibility model?

The shared responsibility model defines which security responsibilities belong to the cloud service provider and which belong to the customer. Providers secure the underlying infrastructure, while customers remain responsible for securing their applications, identities, configurations, operating systems where applicable, and data. The exact division of responsibility depends on the service model being used.

Can a business use more than one cloud service provider?

Yes. Many organizations adopt a multi-cloud strategy by running workloads across multiple cloud service providers. This approach reduces vendor lock-in, improves resilience, and allows organizations to choose the provider best suited for each workload. For example, a business might run enterprise applications on Microsoft Azure while using Rackspace Spot for cost-sensitive Kubernetes workloads or artificial intelligence (AI) training.

Is Rackspace Spot a cloud service provider?

Yes. Rackspace Spot is a cloud service provider that offers managed Kubernetes, virtual machines, networking, storage, load balancing, and managed PostgreSQL Database as a Service (DBaaS). Its auction-based marketplace for Spot instances allows organizations to bid for spare compute capacity, helping reduce infrastructure costs for suitable workloads.

Which cloud service provider is the cheapest?

There is no single cheapest cloud service provider because pricing depends on the services and workloads being deployed. However, for interruption-tolerant workloads, Rackspace Spot's auction-based Spot instances can provide significantly lower compute costs than traditional on-demand pricing offered by many cloud providers.

Which cloud service provider is best for Kubernetes?

Rackspace Spot is an excellent choice for organizations looking to reduce Kubernetes infrastructure costs. It includes a free managed Kubernetes control plane, built-in autoscaling, and support for GitOps workflows through Terraform and spotctl. For organizations that prioritize the broadest ecosystem, global infrastructure, and extensive managed services, AWS, Microsoft Azure, and Google Cloud also offer mature managed Kubernetes platforms.

Which cloud service provider is best for artificial intelligence (AI) workloads?

Rackspace Spot is a strong option for organizations looking to reduce the cost of artificial intelligence (AI) training workloads. Its auction-based Spot instances provide a cost-effective source of compute for fault-tolerant, GPU-intensive jobs. For organizations that need a broader portfolio of artificial intelligence (AI) services, managed machine learning platforms, and global GPU infrastructure, Google Cloud, AWS, and Microsoft Azure offer mature AI ecosystems.

Is Rackspace Spot a good alternative to AWS?

It depends on your workload. AWS offers the broadest cloud platform and largest service catalog, making it well suited for organizations that need a wide range of managed services. Rackspace Spot is a strong alternative for teams prioritizing managed Kubernetes and lower compute costs through its auction-based Spot instances, particularly for batch processing, continuous integration and continuous delivery (CI/CD) pipelines, and artificial intelligence (AI) training workloads.

Can I migrate from AWS, Microsoft Azure, or Google Cloud to Rackspace Spot?

Yes. Rackspace Spot supports common cloud-native tools such as Kubernetes, Terraform, and the spotctl command-line interface (CLI), making it easier to migrate and manage workloads using infrastructure as code. As with any migration, organizations should evaluate application dependencies, networking, storage, and data transfer requirements before moving workloads.