Microsoft .NET framework is collection of wrapper, code, and UI libraries. It covers a wide range of technologies.
The .NET Framework allows you to:
The Microsoft .NET Framework is a software framework that includes a large library of coded solutions to common programming problems, managing the execution of programs.
The .NET Framework is:
The framework's Base Class Library provides a large range of features including user interface, data access, database connectivity, cryptography, web application development, numeric algorithms, and network communications. The class library is used by .NET programmers, who combine it with their own code to produce applications.
Click here for more information about the .NET Framework on the official Microsoft website
To find the version of .net installed on your computer: