ASP.NET is an open-source server-side web application framework designed for web development to produce dynamic web pages. It was developed by Microsoft to allow programmers to build dynamic web sites, web applications and web services. C# is also a part of .NET so it is used alongside languages like ASP in web development and apps. The best programming language to work with the .NET Framework and its APIs is C#. Java is not an alternative for this. And C++ is an older language without automatic memory management. C# is similar to C++ but has automatic memory management and you don't have to work with pointers, which make you more productive.