please refer this link: http://www.codeproject.com/Articles/54576/Understanding-ASP-NET-MVC-Model-View-Controller-Ar

1. ASP.NET MVC is one of the methods of developing ASP.NET applications. In this article, we will go through the overview of ASP.NET MVC by creating a simple application.
2. ASP.NET MVC Framework is Microsoft's Web Application development framework, the other one being traditional webforms framework.
3. MVC or Model View Controller is a design pattern that addresses the separation of concerns(Soc) which is the process of identifying and separating the application into distinct parts like UI, Logic and Data Access.
4. Soc has proven to be useful in the design of web applications. Keeping the view separate from the other parts of the application means that we can easily change the view without affecting the rest of the application.
5. Similarly, if we want to change the main application logic, we just need to change the controller.
6. ASP.NET MVC is an implementation of the MVC design pattern. The framework helps Test Driven Development which is a method of development in which Unit Test Cases are written before the rest of the application.
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