What is cloud computing?

Question by ankur_gupta555: What is cloud computing?
I heard that in cloud computing computers/servers share their resources, software, data with other computer/server so that they can be accessed or delivered or used on demand.
This figure in Wikipedia shows amazon, google, microsoft etc have connected their servers for cloud computing?
http://en.wikipedia.org/wiki/File:Cloud_computing.svg

Is this true? i.e. If we are using Gmail/Yahoo Mail then can our data be stored or processed on MS or any other company server?

Best answer:

Answer by New Bee
Yes Gmail, Yahoo and others are using cloud computing to run their services.
As the demand is huge and can not be served from a single server. So it becomes faster and more redundant in cloud computing.

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