A cloud computing service provider is a company that rents computing resources (servers, storage, databases, networking and software) over the internet, billed by use. The three main providers are Amazon Web Services (AWS), Microsoft Azure and Google Cloud, which together held 63% of the worldwide cloud infrastructure market in Q2 2026.
Key takeaways
- A cloud service provider (CSP) owns and runs the data centres and platforms; you consume them on demand and pay for what you use.
- Providers come in four broad kinds: hyperscalers, specialist or regional infrastructure clouds, SaaS vendors, and managed service providers that operate cloud on your behalf.
- AWS (28%), Microsoft (20%) and Google (15%) are the three largest infrastructure providers, according to Synergy Research Group's Q2 2026 data.
- Security is shared: the provider secures the cloud itself, you secure your data, identities and configuration.
- Choose on fit (existing licences, skills, compliance and support), not on market share alone.
What is a cloud computing service provider?
A cloud computing service provider is a company that owns shared pools of computing resources and lets customers use them over a network, on demand. You do not buy the hardware. You request capacity through a web console or an API, use it for as long as you need, and pay for what you consumed.
The most widely used definition of cloud computing comes from the US National Institute of Standards and Technology. NIST SP 800-145 describes it as a model for "on-demand network access to a shared pool of configurable computing resources" that can be "rapidly provisioned and released with minimal management effort or service provider interaction". It lists five essential characteristics that separate a real cloud service from ordinary hosting:
- On-demand self-service: you provision capacity yourself, without a ticket or a phone call.
- Broad network access: services are reachable over standard networks from any device.
- Resource pooling: the provider serves many customers from the same physical infrastructure.
- Rapid elasticity: capacity grows and shrinks quickly, often automatically.
- Measured service: usage is metered, so you can see and pay for exactly what you used.
If a "cloud" offer requires a three-year hardware contract and a two-week lead time for a new server, it does not meet this definition, whatever the marketing says.
What do cloud service providers offer?
Providers package their resources as service models. The three NIST models describe how much of the stack the provider manages for you.
| Service model | What you get | What you still manage | Examples |
|---|---|---|---|
| Infrastructure as a service (IaaS) | Virtual machines, storage, networks | Operating system, middleware, applications, data | Amazon EC2, Azure Virtual Machines, Google Compute Engine |
| Platform as a service (PaaS) | Managed runtime, databases, developer tools | Your application code and data | Azure App Service, Amazon RDS, Google Cloud Run |
| Software as a service (SaaS) | Finished applications in a browser | Users, settings and your data | Microsoft 365, Salesforce, Google Workspace |
Many providers also sell serverless functions, where you upload code and pay per execution. Our guide to the four types of cloud services covers each model in more depth.
What types of cloud service providers are there?
Cloud computing service providers range from global platforms to niche specialists, so "cloud provider" covers very different businesses. Knowing which kind you are talking to helps you compare offers fairly.
- Hyperscalers. AWS, Microsoft Azure and Google Cloud run global networks of data centres and sell hundreds of IaaS and PaaS services. They suit almost any workload, from a single website to a global SaaS platform.
- Specialist and regional infrastructure clouds. Oracle Cloud Infrastructure, Alibaba Cloud, IBM Cloud and EU-headquartered providers such as OVHcloud or Hetzner. They often win on a specific need: Oracle databases, China coverage, or EU ownership.
- SaaS vendors. Companies that sell a finished application, such as Microsoft 365 or Salesforce. They are cloud providers too, but you buy a product, not infrastructure.
- Managed service providers (MSPs) and partners. Firms that design, migrate and operate your environment on top of a hyperscaler. They do not own the data centres; they own the day-to-day operations and the outcome.
Who are the three main providers of cloud services?
The three main providers are AWS, Microsoft Azure and Google Cloud. According to Synergy Research Group's Q2 2026 release (30 July 2026), Amazon held 28% of worldwide cloud infrastructure services, Microsoft 20% and Google 15%. The whole market reached $143.4 billion in that quarter.
Amazon Web Services (AWS)
AWS started selling cloud services in 2006 and is still the largest provider. It has the broadest catalogue of managed services and the biggest partner ecosystem. It is the common default for SaaS companies and for general infrastructure migrations. Its main drawback is complexity: IAM, networking and billing all take real expertise to run well.
Microsoft Azure
Azure became generally available in 2010. Its advantage is integration with what most companies already run: Entra ID (formerly Azure Active Directory), Microsoft 365, Windows Server and SQL Server. Licence benefits and hybrid tooling such as Azure Arc make it a strong choice for Microsoft-centric enterprises.
Google Cloud
Google Cloud is built on the infrastructure behind Google's own products. It is strongest in analytics (BigQuery), Kubernetes (Google created the project) and machine learning (Vertex AI and TPUs). Its partner ecosystem is smaller than those of AWS and Azure, but it is often the first choice for data-heavy products.
For a detailed side-by-side on services, pricing and regions, see our AWS vs Azure vs GCP comparison. For a wider list that includes Alibaba Cloud and Oracle, see the top five cloud service providers.
Why do companies use a cloud service provider?
Most teams move to a cloud provider for speed and flexibility, not because the cloud is automatically cheaper.
- No hardware purchases: capacity becomes an operating cost instead of a capital project with a hardware refresh cycle every few years.
- Faster delivery: a test environment takes minutes rather than a procurement round.
- Elastic capacity: seasonal or unpredictable demand no longer means sizing for the peak all year.
- Managed building blocks: databases, queues, identity and AI services come ready to use, so teams build less plumbing.
- Reach: you can run close to users in Europe, India or elsewhere without opening data centres.
The trade-offs are real. Costs are easy to lose track of: in Flexera's 2026 State of the Cloud survey (March 2026), 85% of respondents named managing cloud spend as a top challenge, and they estimated 29% of their cloud spend was wasted. Deep use of one provider's managed services also makes a later move harder, so decide early which services you are willing to be tied to.
What is the difference between a cloud provider and a managed service provider?
A cloud provider supplies the platform; a managed service provider runs your workloads on it. AWS will keep its data centres and hypervisors secure and available. It will not patch your operating systems, tune your databases or answer your 03:00 alert.
That split is written into every hyperscaler's shared responsibility model: the provider is responsible for security "of" the cloud, and the customer for security "in" the cloud. Your share grows as you move from SaaS towards IaaS.
Many organisations close that gap with a partner. In Flexera's 2025 State of the Cloud Report, based on 759 cloud decision-makers, 60% of organisations said they use MSPs in some capacity to manage public cloud.
| Responsibility | Cloud provider (for example AWS) | You, or your MSP |
|---|---|---|
| Data centres, hardware, hypervisor | Yes | No |
| Operating system patching (IaaS) | No | Yes |
| Identity and access configuration | Provides the tools | Yes |
| Backups and recovery testing | Provides the tools | Yes |
| 24/7 monitoring of your applications | No | Yes |
| Cost optimisation | Provides reports and discounts | Yes |
How do you choose a cloud service provider?
Shortlist on fit, then test with a real workload. These questions cover most decisions.
- Existing estate: which licences, identity system and databases do you already run? Microsoft shops often save money on Azure; Oracle estates on OCI.
- Data location and law: do you need data kept in the EU or in India? All three hyperscalers run regions in Sweden and in India, but check that the specific services you need are available there.
- Compliance evidence: ask for the certifications and audit reports your auditors expect, such as ISO/IEC 27001 and SOC 2, and check the contract terms for GDPR or India's DPDP Act.
- Skills: the provider your team already knows will be cheaper and safer to run than the one with the best list price.
- Support and operations: decide who answers alerts at night. Compare the provider's paid support plans with what an MSP adds.
- Cost model: price your actual instance sizes, storage and data transfer, including commitment discounts. Avoid comparing headline rates.
Example: provider plus operating partner
Opus Bilprovning runs close to 100 vehicle inspection stations across Sweden and inspects around two million vehicles a year. Its cloud platform runs on AWS. Opsio provides 24/7 managed operations across CloudOps, DevOps and SecOps, so AWS supplies the infrastructure and Opsio is the single accountable team for running it. Read the Opus Bilprovning case study to see how the operating model works.
How Opsio helps
Opsio is a managed cloud provider with offices in Karlstad, Sweden and Bangalore, India, and an AWS Advanced Partner. We help you pick the right provider for each workload, then design, migrate and operate it. See our managed cloud services or the AWS managed service provider page for what that includes.
Frequently asked questions
What is a cloud service provider in simple terms?
It is a company that rents you computing power, storage, databases or software over the internet. You use what you need, when you need it, and pay for what you used instead of buying and running your own hardware.
What are some examples of cloud service providers?
The largest are Amazon Web Services, Microsoft Azure and Google Cloud. Others include Oracle Cloud Infrastructure, Alibaba Cloud and IBM Cloud, EU-headquartered providers such as OVHcloud and Hetzner, and SaaS vendors such as Salesforce and Microsoft 365.
What are the 3 cloud services?
The three standard cloud service models are infrastructure as a service (IaaS), platform as a service (PaaS) and software as a service (SaaS), as defined in NIST SP 800-145. Serverless functions are often counted as a fourth type.
Is AWS a cloud service provider?
Yes. AWS is the largest cloud infrastructure provider, with 28% of worldwide spending in Q2 2026 according to Synergy Research Group. It sells IaaS, PaaS and serverless services from Regions around the world, including Stockholm, Mumbai and Hyderabad.
Is a managed service provider the same as a cloud provider?
No. A cloud provider owns and runs the platform. A managed service provider operates your workloads on that platform: monitoring, patching, backups, security and cost control. Many companies use both.
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Written By
Country Manager, India
Praveena leads Opsio's India operations, bringing 17+ years of cross-industry experience spanning AI, manufacturing, DevOps, and managed services.
Editorial standards: This article was written by the cloud practitioner named in the byline above. We revise it when the technology or regulation it covers changes; the dates on this page show the latest update. Opsio maintains editorial independence.