ASP .NET MVC (Model-View-Controller) is a popular web application framework developed by Microsoft that allows developers to build dynamic, data-driven web applications. In this framework, the application is divided into three interconnected components: the Model, View, and Controller.

The Model component represents the application data and business logic, and is responsible for handling data access and manipulation. The View component is responsible for displaying the data to the user in a user-friendly format. The Controller component handles user requests and interactions, and is responsible for managing the flow of data between the Model and the View.

1. Separation of concerns: The MVC architecture separates the application logic into three distinct components, making it easier to manage, maintain, and modify the code.
2. Testability: The MVC framework provides built-in support for unit testing, making it easier to write and execute test cases.
3. Flexibility: ASP .NET MVC allows developers to use a wide range of programming languages, libraries, and tools, giving them the flexibility to choose the most appropriate technologies for their project.
4. Performance: ASP .NET MVC is built on the .NET Framework, which is known for its high performance and scalability.
5. Security: ASP .NET MVC includes built-in security features that help protect web applications from common security threats such as cross-site scripting (XSS) and SQL injection attacks.