Cloud computing is simply a buzzword used to repackage grid computing and utility computing, both of which have existed for decades.” whatis.com definition of Cloud Computing.
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Cloud computing is a style of computing in which dynamically scalable and often virtualized resources are provided as a service over the Internet.
Users need not have knowledge of, expertise in, or control over the technology infrastructure in the "cloud" that supports them.[
The act of joining multiple computer together to work on a complex problem with the intent to find a solution much faster (grid).
Virtual Private Cloud
(not own data center, hardware; use outside provider of servers, storage, and bandwidth)
(tens of thousands of server computers)
Platform as a Service (PaaS)
Cloud-based User Applications