The cloud is protected plenty of remote servers that hosted for the on multilple web sites. It’s the delivery of on-demand computing services. Using cloud-computing, users are able to access software and applications no matter where they desire, even though it is being hosted by some other party. One benefit of utilizing cloud-computing services is the fact that firms can steer clear of the upfront cost and complexity of owning and maintaining their own IT infrastructure, and instead simply pay for the things they use after they apply it. With cloud computing, you don’t intend to make large upfront investments in hardware and spend considerable time on the heavy-lifting of managing that hardware.
The primary important things about cloud computing are :
1. Trade capital expense for variable expense
2. Stop guessing capacity
3. Go global within minutes
4. Benefit from massive economies of scale
5. Increase speed and agility
6. Stop spending money on running and maintaining data centers

The primary varieties of cloud-computing or you can say cloud computing services :

Software being a service (SaaS) –
Useful owned and operated by others understanding that connect with users’ computers over the internet and, usually, a web browser.
Platform like a service (PaaS) – is a complete development and deployment environment from the cloud, with resources that enable you to deliver sets from simple cloud-based apps to sophisticated, cloud-enabled enterprise applications.
Infrastructure like a service (IaaS) – Provides companies with computing resources including servers, networking, storage, and data center space on the pay-per-use basis.

For additional information about types of cloud computing check this web portal.