C# is a powerful high-level object-oriented programming language. You can do a lot of different things using C#!

You can:
- create web applications, using Web Forms and ASP.NET MVC
- create desktop applications
- create games (using Mono Game or similar platforms).
- and much more!

C# helps to create a better GUI, than, for example, Java. And it is not so complicated as C++.

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Here asp.net is the framework whereas the c# is the coding language. So there both work to gather. You can not seperate it.