What Is Cloud Computing? A Plain-English Guide for Businesses
Cloud computing means using computing power, storage and software over the internet, rented from a provider, instead of owning and running your own equipment. You pay for what you use, you can grow or shrink what you rent, and the provider looks after the hardware. Email in a browser, online accounting and a server you control from your laptop are all cloud computing.
In short
- Rented, not owned. Someone else runs the machines, and you use them over the internet.
- Three layers. Software you log in to, a platform to build on, or raw servers to run anything. Each leaves you with more or less to manage.
- Pay for what you use, usually monthly, with no equipment to buy.
- Responsibility is shared. The provider keeps the hardware and the network healthy. You keep what you put on it.
- Where it runs still matters. For many South African businesses, that means servers in South Africa.
What is cloud computing?
The US National Institute of Standards and Technology (NIST) defines it as a model for enabling convenient, on-demand network access to a shared pool of configurable computing resources, such as networks, servers, storage and applications, that can be provisioned and released with minimal management effort. In plain words: a provider owns a large pool of computers, and you borrow a slice of it, for as long as you need, over the internet.
You already use it. When your email sits in a browser tab, your documents save themselves and your accounts live online, a provider is running the computers behind them.
What are the five features of the cloud?
NIST lists five essential characteristics. Here they are in plain language:
| Feature | What it means for you |
|---|---|
| On-demand self-service | You can get resources when you need them, without a long procurement |
| Broad network access | You reach it from any device with an internet connection |
| Resource pooling | The provider shares its hardware between many customers |
| Rapid elasticity | You can use more or less as your needs change |
| Measured service | Usage is metered, so you pay for what you use |
Providers differ in how fully they offer each one. A simple monthly server is the plain end of the cloud, and a giant platform with automatic scaling is the other.
What are the types of cloud service?
There are three service models, and they differ in how much you manage:
| Model | What you get | You manage | Example |
|---|---|---|---|
| Software as a service (SaaS) | A finished application | Your data and settings | Web-based email, online accounting |
| Platform as a service (PaaS) | A place to run your own code | Your application | A hosting platform for developers |
| Infrastructure as a service (IaaS) | A server, storage and network | The operating system and everything above it | A Linux cloud server |
The further down the table, the more control you have, and the more you look after. A cloud server gives you root access and the freedom to install anything, along with the duty to keep it updated and secure.
What are public, private and hybrid clouds?
| Deployment | What it is | Suits |
|---|---|---|
| Public cloud | Shared infrastructure rented from a provider | Most businesses |
| Private cloud | Infrastructure used by one organisation only | Strict isolation or compliance needs |
| Hybrid cloud | A mix of your own and rented infrastructure | Keeping some systems close |
Colocation, dedicated server or private cloud: which fits your business? compares the private end.
How is a cloud server different from shared hosting?
| Shared hosting | Cloud server | |
|---|---|---|
| What you rent | A share of a server, managed for you | A server of your own, with stated resources |
| Control | A control panel | Full root access |
| Management | The provider updates and secures the platform | You manage the operating system and software |
| Best for | Websites, blogs, shops and email | Applications, tools and workloads that need their own software |
Most small business websites do well on shared hosting. A cloud server suits someone who wants to run their own software and is happy to look after it. Legacy, Premium or Cloud: which hosting plan fits your site? helps you choose, and What is web hosting? explains the basics.
What are the benefits of cloud computing?
- No equipment to buy or house. You rent a server, and you skip the cost and space of owning one.
- Predictable monthly cost. You pay for what you provision, in a known amount.
- Room to grow. You can move to a larger server when your work needs it.
- Access from anywhere, on any device.
- Resilience. A provider's network and hardware are built to a standard that is hard to match at home or in the office.
The true cost of web hosting shows what to compare when you weigh cost.
What should you watch for?
- Shared responsibility. The provider looks after the platform, and you look after what you run on it: updates, security patches and backups. Know where the line sits before you start.
- Where your data lives. Under South Africa's Protection of Personal Information Act (POPIA), you remain responsible for personal information you store. POPIA and GDPR: what compliant hosting actually means explains what to ask.
- Backups. A cloud server is not always backed up automatically. Check what your provider keeps and for how long.
- Skills. A server of your own needs someone who can look after it, or a managed option that does.
Who is cloud computing for?
It suits businesses that run their own applications, developers who want a server of their own, teams that outgrow shared hosting, and anyone who wants to run tools such as an accounting system, a file-sharing platform or an AI assistant on a server they control. Choosing where to run AI covers the last case.
What does cloud computing look like at Noiz?
Noiz Cloud is the infrastructure layer: a Linux server of your own, with a stated allocation of cores, memory, disk and transfer, a dedicated IPv4 address, full root access over SSH and a fresh install of Ubuntu or Debian. Each server is provisioned within one working day and billed monthly, in rand, with servers in South Africa. We keep the hardware, the virtualisation layer and the network healthy, and you own the operating system and everything on it. Snapshots and daily backups can be added, and if you would rather we ran the operating system or the application as well, managed options are available. The Specific Terms and Acceptable Use Policy set out the split in full.
Not sure what size or type of server your project needs? Tell us what you will run and how busy it gets, and we will say which fits, or if none does, on the Noiz Cloud page.
Read next
- Legacy, Premium or Cloud: which hosting plan fits your site?
- Why Premium hosting beats an unmanaged VPS for most websites
- Choosing where to run AI: shared hosting, a server of your own, or a GPU
Sources
- NIST SP 800-145: The NIST Definition of Cloud Computing: the definition, characteristics, service and deployment models.
- Noiz Cloud: the servers described, read on 10 November 2026.
Note: while some of this content was produced with the help of AI, the final editing has been done by a real human being.
