Answer: Model-View-Controller (MVC) is a classic design pattern often used by applications that need the ability to maintain multiple views of the same data. The MVC pattern hinges on a clean separation of objects into one of three categories — models for maintaining data, views for displaying all or a portion of the data, and controllers for handling events that affect the model or view(s).

Wikipedia article.
http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller








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