What is Cloud Hosting?

Cloud hosting is typically delivered as infrastructure as a service (IaaS), one of the three cloud service models NIST defines. In plain terms, you rent computing power, storage, and networking over the internet instead of owning the hardware. The model can be more flexible and reliable than traditional options like shared hosting: when one server in the network goes down, another can take over until it's fixed.

How cloud hosting works

Your site doesn't live on one machine. It runs on virtual servers, which are software-defined servers created by a virtualization layer that pools the CPU, RAM, and storage of many physical machines. The platform allocates resources from that pool and can shift workloads off failed hardware, which is how a well-built cloud setup delivers high uptime even while individual servers break.

That resilience is a capability, not a default. On many plans, redundancy and autoscaling have to be set up: multiple instances of your site behind a load balancer, scaling rules that add capacity at a threshold you choose, or a managed service that configures it for you. Ask what a plan includes before you assume failover is part of it.

Growth works the same way. Picture a store that triples its traffic during a holiday sale. With autoscaling configured to add instances once CPU use crosses a set threshold, the platform adds capacity for the rush and removes it when traffic falls. Billing rules vary, though: storage, outbound data transfer, reserved capacity, and minimum billing periods can stay on the bill after the extra compute is gone.

Public, private, and hybrid cloud

With traditional hosting, you choose a tier: shared, VPS, or dedicated. Cloud hosting is instead deployed as a public, private, or hybrid cloud (NIST SP 800-145 defines four deployment models in total).

• Public cloud: your virtual servers run on infrastructure shared with many other customers, logically isolated from one another. It's the least expensive model and the way most websites use the cloud.
• Private cloud: the resource pool is dedicated to one organization, typically on dedicated hardware. You get more control for compliance-sensitive workloads and pay more for it.
• Hybrid cloud: a mix of both, keeping sensitive systems private while the public cloud handles everything else.

Unless a compliance requirement forces the issue, a typical website owner is choosing public cloud.

Cloud hosting vs. VPS hosting

A VPS (virtual private server) is also a virtual server, so the two are easy to confuse. The difference is where the resources come from:

• A VPS is a fixed slice of one physical server. You get a set amount of CPU, RAM, and storage for a predictable monthly price.
• Cloud hosting draws resources from a pool spread across many servers, can scale them on demand, and typically bills by usage.

The line blurs in practice, since many modern VPS products run on cloud infrastructure. The distinction that matters is fixed resources at a fixed price versus elastic resources at a variable one.

When to choose cloud hosting

Cloud hosting suits sites whose traffic spikes or grows unpredictably. Match the plan type to the problem:

• Web hosting for a small site with steady traffic and a tight budget.
• A VPS when you need guaranteed resources at a fixed monthly price.
• Cloud hosting when traffic rises and falls unpredictably and you need to scale up and down on demand.
• A dedicated server when you need an entire physical machine to yourself.

Costs and trade-offs

Cloud plans typically bill for what you use, per hour of server time or per GB of storage and bandwidth, rather than a flat monthly rate. That cuts both ways: quiet months cost less, but a busy month raises the bill, which is exactly the trade-off against a fixed-price VPS.

Two more trade-offs are worth naming. Unmanaged cloud platforms expect more technical skill than an entry-level web hosting plan. And for a small site with steady traffic, elasticity is capacity you pay a premium for and never use. For a deeper look at when it pays off, see our guide to the benefits of cloud hosting.