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Explain the difference between 3-layer architecture and MVC architecture.

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MVC is an evolution of a three layered traditional architecture. Many components of the three layered architecture are the part of MVC.

A fundamental rule in three tier architecture is the client tier never communicate directly with the data tier. In a three-tier model all communication must pass through the middle tier.

MVC architecture is triangular. The view sends updates to the controller, the controller updates the model, and the view gets updated directly from the model.