ASP.NET MVC gives you a powerful, patterns-based way to build dynamic websites

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ASP.NET MVC gives you a powerful, patterns-based way to build dynamic websites that enables a clean separation of concerns and that gives you full control over markup for enjoyable, agile development. ASP.NET MVC includes many features that enable fast, TDD-friendly development for creating sophisticated applications that use the latest web standards.

MVC : The Official Microsoft ASP.NET Site