The cloud is roofed lots of remote servers that hosted about the all over the internet. It’s the delivery of on-demand computing services. Using cloud-computing, users can access software and applications from wherever they want, while it’s being hosted by some other party. Just one benefit utilizing cloud computing services is that firms can avoid the upfront cost and complexity of owning tweaking their particular IT infrastructure, and instead simply purchase what they use once they use it. With cloud computing, you don’t desire to make large upfront investments in hardware and spend time and effort for the work of managing that hardware.
The primary advantages of cloud computing are :
1. Trade capital expense for variable expense
2. Stop guessing capacity
3. Go global in seconds
4. Make use of massive economies of scale
5. Increase strength and speed
6. Stop investing in running tweaking data centers

The primary kinds of cloud-computing additionally, you can say cloud computing services :

Software being a service (SaaS) –
Useful owned and operated by others and that connect with users’ computers online and, usually, an internet browser.
Platform as a service (PaaS) – can be a complete development and deployment environment in the cloud, with resources that enable you to deliver anything from simple cloud-based apps to classy, cloud-enabled enterprise applications.
Infrastructure like a service (IaaS) – Provides companies with computing resources including servers, networking, storage, and knowledge center space over a pay-per-use basis.

More details about types of cloud computing check this popular site.