Cloud computing is Internet ("cloud") based development and use of computer technology ("computing")[1][2][3]. It is a business information management style of computing in which typically real-time scalable[4] resources are provided “as a service”[5] over the Internet[6] to users who need not have knowledge of, expertise in, or control over the technology infrastructure ("in the cloud") that supports them[7].
It is a general concept that incorporates software as a service (SaaS), Web 2.0 and other recent, well-known technology trends, in which the common theme is reliance on the Internet for satisfying the computing needs of the users. An often-quoted example is Google Apps, which provides common business applications online that are accessed from a web browser, while the software and data are stored on Google servers.
The cloud is a metaphor for the Internet, based on how it is depicted in computer network diagrams, and is an abstraction for the complex infrastructure it conceals.[8]
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