Cloud computing
Cloud computing is the delivery of computing as a service rather than a product, whereby shared resources, software, and information are provided to computers and other devices as a utility (like the electricity grid) over a network (typically the Internet). Clouds can be classified as public, private or hybrid
Cloud computing metaphor: For a user, the network elements representing the provider-rendered services are invisible, as if obscured by a cloud.
Another representation of the cloud computing model. Here, the emphasis is on the delivery of a service.
from : http://en.wikipedia.org/wiki/Cloud_computing online 30/08/2014
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