a web application framework that implements the model-view-controller (MVC) pattern.
Based on ASP.NET, it allows software developers to build a web application as a composition of three roles: Model, View and Controller. A model represents the state of a particular aspect of the application. A controller handles interactions and updates the model to reflect a change in state of the application, and then passes information to the view. A view accepts necessary information from the controller and renders a user interface to display that information. In April 2009, the ASP.NET MVC source code was released under the Microsoft Public License (MS-PL). ASP.NET MVC framework is a lightweight, highly testable presentation framework that is integrated with existing ASP.NET features. Some of these integrated features are master pages and membership-based authentication. The MVC framework is defined in the System.Web.Mvc assembly. The ASP.NET MVC Framework couples the models, views, and controllers using interface-based contracts, thereby allowing each component to be easily tested independently.
The view engines used in the ASP.NET MVC 3 and MVC 4 Frameworks are the Razor View Engine and the Web Forms view engine. Both view engines are part of the MVC 3 framework. By default, the view engine in the MVC framework uses Razor .cshtml and .vbhtml, or Web Forms .aspx pages to design the layout of the user interface pages onto which the data is composed. However, different view engines can be used. Additionally, rather than the default ASP.NET Web Forms postback model, any interactions are routed to the controllers using the ASP.NET Routing mechanism. Views can be mapped to REST-friendly URLs.