.NET Framework to develop software applications. It is designed and developed by Microsoft and the first beta version released in 2000.
It is used to develop applications for web, Windows, phone. Moreover, it provides a broad range of functionalities and support.
This framework contains a large number of class libraries known as Framework Class Library (FCL). The software programs written in .NET are executed in the execution environment, which is called CLR (Common Language Runtime). These are the core and essential parts of the .NET framework.