.NET is a framework for software development based on the CLR ("Common Language Runtime") standard.
.NET itself is a collection of libraries and tools as well as an implementation of the runtime environment. .NET was developed and published by Microsoft. The source code is available under an MIT license on GitHub.
Questions uses the .net
tag should pertain to the use of the framework itself and/or its libraries. Use language-specific tags for questions dealing with common .NET languages such as c# or vb.net