Unlike the patterns we have seen this far, Model-View-Controller (MVC) is actually quite complex. Its goal is that of providing a methodology for separating the business logic (model) from the display logic (view) and the decisional controls (controller). In a typical MVC setup, the user initiates an action (even a default one) by calling the Controller. This, in turn, interfaces with the Model, causing it to perform some sort of action and, therefore, changing its state. Finally, the View is called, thus causing the user interface to be refreshed to reflect the changes in the Model and the action requested of the Controller, and the cycle begins anew.
The clear advantage of the MVC pattern is its clear-cut approach to separating each domain of an application into a separate container. This, in turn, makes your applications easier to maintain and to extend, particularly because you can easily modularize each element, minimizing the possibility of code duplication.
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