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What the heck is cloud computing?

It isn't a new idea but is now gaining a lot of adherents because of new technology and standards.

The cloud is a metaphor for the Internet, based on how it is depicted in computer network diagrams.

It is essentially a computing paradigm in which tasks are assigned to a combination of connections, software and services accessed over a network.

This network of servers and connections is collectively known as "the cloud." Computing at the scale of the cloud allows users to access supercomputer-level power. Using a thin client or other access point, like an iPhone, BlackBerry or laptop, users can reach into the cloud for resources as they need them.

You can watch an explanation ( not read, watch ) about it here :

http://video.google.com/videosearch?hl=en&q=what+is+cloud+computing&um=1&ie=UTF-8&sa=X&oi=video_result_group&resnum=4&ct=title#