We define cloud computing in simplest terms, as follows: A set of pooled computing resources, delivered over the web, powered by software. Cloud computing – not to be confused with grid computing, utility computing, or autonomic computing – is a form of computing that involves the interaction of several virtualized resources, meaning that many servers are connecting and sharing information that can expand and contract across servers depending on the amount of servers needed to manage the amount of traffic on various sites. Cloud computing is often provided “as a service” over the internet, typically in the form of infrastructure as a service (IaaS), platform as a service (PaaS), or software as a service (SaaS). The “cloud” in “cloud computing” stems from the interconnectivity of the computers and computer networks that form the internet because, when these relationships are diagramed, the resulting image looks like a cloud.

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