What Is Cloud Computing ?

Cloud computing is a style of computing in which dynamically scalable and often virtualised resources are provided as a service over the Internet.Users need not have knowledge of, expertise in, or control over the technology infrastructure "in the cloud" that supports them.

The best example : Google Apps which provides common business applications online that are accessed from a web browser, while the software and data are stored on the servers.The term cloud is used as a metaphor for the Internet.

The concept incorporates infrastructure as a service (IaaS), platform as a service (PaaS) and software as a service (SaaS) as well as Web 2.0 and other recent technology trends that have the common theme of reliance on the Internet for satisfying the computing needs of the users.