Cloud computing is a process of delivering software services to users with the help of internet technologies. Cloud computing services that are delivered on the demand-service type and are chargeable. In a purpose to increase its usage, cloud computing service providers offer self-service capabilities to users with scalable features.
What makes cloud computing different?
In this, the service you use is provided by someone else and managed on your behalf. So if you're using Google Documents, you don't have to worry about buying umpteen licenses for word-processing software or keeping them up-to-date. Neither you have to worry about viruses that may affect your computer or about backing up the files you create. Google does all that for you. One addition of cloud computing is that you no longer need to worry how the service you're buying is provided: with Web-based services, you will simply concentrate on whatever your job is and you just need to leave the problem of providing dependable computing to someone else.
Cloud services are also available on-demand and often bought on a "pay” or subscription basis. So you are typical if you buy cloud computing the same way you'd buy electricity, telephone services, or Internet access from a utility company. Sometimes cloud computing is free or paid-for in different ways Hotmail is subsidized by advertising, for example.
It's public or private
Now we all have laptops, we're used to having complete control over our computer systems—and complete responsibility for them as well. Cloud computing changes all of that. So basically It comes in two basic flavours, public and private, which are the cloud identical of the Internet and Intranets. Web-based email and free services are the ones Google provides the most familiar examples of public clouds. In early 2006 The world's biggest online retailer, Amazon, became the world's largest provider of public cloud computing. When it was found it was using only a fraction of its huge, computing power, it started renting out its spare capacity over the Net through a new entity called Amazon Web Services. Private cloud computing works in similar the same way but you access the resources you use through secure network connections, much like an Internet.