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).

Because of this separation, multiple views and controllers 
can interface with the same model. Even new types of views 
and controllers that never existed before can interface 
with a model without forcing a change in the model design.