Published: September 11, 2026
Last Updated: September 11, 2026
Cloud computing means you’re renting, not buying. Servers, storage, software — all of it lives somewhere else and runs over the internet, so there’s no hardware sitting in a closet that you have to maintain. Most businesses run their IT this way now because it’s cheaper to pay as you go than to own equipment outright.
Quick Answer: You rent computing resources — servers, storage, software — over the internet instead of owning the hardware.
Definition: Buying and maintaining physical servers used to be the only option. Cloud computing replaced that with renting computing power, storage, and software over the internet instead.
Quick facts on cloud computing
| Metric |
Standalone fact |
| IaaS market size |
The global IaaS market is projected to reach $212.34 billion by 2028, growing at an 18.3% CAGR from 2024 (The Business Research Company, 2025) |
| SaaS market size |
Needs source verification before publishing — see note above |
| Hybrid cloud adoption |
More than 77% of businesses and IT professionals report using a hybrid cloud approach (IBM Institute for Business Value) |
| Multicloud usage |
Needs a real source and accurate figure before publishing — see note above; current wording appears unsupported |
| Public cloud spending |
Worldwide spending on public cloud services is forecast to double between 2024 and 2028 (IDC) |
| First commercial cloud service |
Amazon Web Services launched its first cloud storage and computing products, S3 and EC2, in 2006 |
Methodology: Figures are drawn from publicly available sources, including vendor disclosures, analyst reports, and third-party publications.
What is cloud computing and how does it work?
Cloud computing works by splitting one physical server into many smaller, independent virtual ones, then renting access to those virtual servers over the internet. A cloud service provider (CSP) owns and runs the actual data centers. You never touch the hardware — you just log in and use what you need.
Here’s the mechanism in order:
- A CSP builds a data center full of physical servers.
- A piece of software called a hypervisor splits each physical server into multiple virtual machines, with each one acting like its own independent computer.
- Those virtual machines then get pooled into a shared resource pool that many customers draw from at the same time.
- From there, you simply request what you need — a server, storage, a database — through a web console or API.
- The CSP provisions what you asked for in minutes, and bills you only for what you use.
Amazon Web Services became the first major commercial cloud provider, launching cloud-based services in 2002 and then introducing Elastic Compute Cloud (EC2) in 2006 — letting customers rent virtual servers on demand for the first time. Google followed the same year with the Google Apps suite, now known as Google Workspace, one of the earliest mainstream SaaS products. Microsoft came later, entering the space with its Business Productivity Online Suite (BPOS) in 2008 before replacing it with the more fully realized Office 365 in 2011.
The core idea actually traces back much further than any of these launches. Computer scientist J.C.R. Licklider described an “Intergalactic Computer Network” in a series of memos in the early 1960s — decades before the infrastructure existed to build anything like it.
What are the main types of cloud computing services?
There are three main service models, and they differ by how much of the technical stack the provider manages for you versus how much you manage yourself.
Infrastructure as a service (IaaS) gives you the raw building blocks — virtual servers, storage, and networking — over the internet on a pay-as-you-go basis. You still install and manage your own operating system and applications on top of it. IaaS is closest to running your own physical servers, just without owning the hardware. The global IaaS market is projected to reach $212.34 billion by 2028, growing at an 18.3% CAGR from 2024, according to The Business Research Company’s IaaS market report.
Platform as a service (PaaS) builds on IaaS by adding the operating system, middleware, and development tools, so developers can build and deploy applications without managing the underlying servers. It’s essentially IaaS with an extra managed layer stacked on top — easier to picture once you understand what IaaS covers.
Software as a service (SaaS) hands you a finished application, ready to use through a browser, with the provider handling everything underneath: servers, storage, security patches, and updates. SaaS is the model most people actually interact with day to day — Gmail, Salesforce, and Netflix are all SaaS products.
A fourth model, serverless computing, sits on top of IaaS and PaaS, running your code only when triggered by an event and billing you per execution instead of for idle server time
Public, private and hybrid cloud deployment models explained
A deployment model describes who owns the infrastructure and who else shares it with you, not what services run on it.
- Public cloud is infrastructure a third-party provider owns and shares across many customers at once. AWS, Google Cloud, and Microsoft Azure all sell public cloud access, and pricing is usually pay-per-use.
- Private cloud is infrastructure dedicated to a single organization, either hosted on-premises or on rented infrastructure that nobody else touches. Regulated industries like healthcare and finance often choose private cloud to meet compliance requirements around sensitive data.
- Hybrid cloud combines public cloud, private cloud, and on-premises systems into one connected setup, letting an organization keep sensitive workloads private while bursting overflow demand into the public cloud when needed.
What are the benefits and disadvantages of cloud computing?
The honest answer: cloud computing isn’t universally cheaper than running your own servers. It’s cheaper for variable or growing workloads. It can cost more for steady, high-utilization workloads that would keep owned hardware busy around the clock anyway. Most vendor pages skip this because the simpler pitch sells better.
Real benefits, with numbers attached:
- Cost structure shifts from fixed to variable. You stop paying upfront for servers you might not fully use and instead pay only for what you consume, which is why AWS lists this as the first of its six core advantages.
- Speed to deploy drops from weeks to minutes. New IT resources become available almost immediately instead of waiting on procurement and hardware setup.
- Energy and carbon impact can drop meaningfully. Shifting workloads to the cloud can cut energy consumption and carbon emissions by at least 30%, according to an analysis by Future Processing.
- Global reach happens without new data centers. Applications can deploy across multiple regions in minutes, reducing latency for users far from your original location.
Real disadvantages, without softening them:
- Downtime is out of your hands. Cloud systems depend entirely on internet connectivity and the provider’s uptime. Google suffered three severe outages in 2020 that affected the majority of its services and users worldwide — a reminder that even top-tier providers go down.
- Costs can creep past estimates. Pay-as-you-go pricing sounds simple, but overall spend can end up higher than expected if usage isn’t monitored and auto-scaling isn’t configured correctly.
- Vendor lock-in is a real switching cost. Moving workloads between providers later can be expensive and technically complex once you’ve built around one vendor’s specific tools.
Cloud computing applications, security and on-premises alternatives
Cloud security runs on a shared responsibility model: the provider secures the underlying infrastructure, while you’re responsible for securing your own data and access controls within it. That split matters, because a secure cloud provider doesn’t automatically mean your data is secure — misconfigured permissions remain one of the most common causes of cloud data exposure.
Common cloud computing applications:
- Data backup and disaster recovery — replacing physical backup infrastructure with redundant cloud storage across multiple locations.
- Software development and testing — spinning up and tearing down test environments in minutes instead of provisioning physical servers.
- Big data analytics — processing large volumes of data using elastic compute resources that scale up only when needed.
- Remote work enablement — making applications and files accessible from any device with an internet connection.
- Edge and IoT support — bringing data processing closer to connected devices to reduce latency.
For organizations that can’t move certain workloads to the cloud — whether for compliance, latency, or cost reasons — on-premises infrastructure remains the alternative. Many organizations run both side by side under a hybrid model rather than choosing one exclusively.
Worldwide spending on public cloud services is forecast to double between 2024 and 2028, according to IDC’s spending guide, which tracks with the broader shift Gartner has predicted toward cloud as standard infrastructure rather than emerging technology.
Frequently asked questions
1. What is cloud computing in simple terms?
Cloud computing means using someone else’s computers — owned and maintained by a company like AWS or Google — to store data or run software over the internet, instead of buying and maintaining your own servers.
2. What are the 3 types of cloud computing?
The three main service types are Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). They differ by how much of the technical stack the provider manages for you versus what you manage yourself.
3. Is cloud computing safe?
Cloud computing runs on a shared responsibility model: the provider secures the physical infrastructure, while you’re responsible for securing your own data, access permissions, and configurations within it.
4. What is an example of cloud computing?
Gmail, Netflix, and Dropbox are all everyday examples — each runs on infrastructure you never see, delivered to you as a finished service over the internet.
5. What is the difference between public, private, and hybrid cloud?
Public cloud is shared infrastructure owned by a third-party provider. Private cloud is dedicated to a single organization. Hybrid cloud combines both, alongside on-premises systems, in one connected setup.
