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Cloud computing refers to the use of scalable, real-time, Internet-based information technology services and resources. This concept incorporates software as a service (SaaS), utility computing, Web 2.0 and other technology trends of the second half of the first decade of the 21st century.

The cloud element of cloud computing derives from a metaphor used for the Internet, from the way it is often depicted in computer network diagrams, and is an abstraction for the complex infrastructure it conceals.