The .NET Framework, developed by Microsoft is basically a software framework. It runs on Microsoft Windows. It provides a feature of interoperability (each language can use code written in other languages) between other different languages. The .NET Framework also includes a class of large library that provides provides user interface, data access, database connectivity, cryptography, web application etc. It provides a software environment known as CLR (common language runtime) which allows the program written for .NET Framework to execute. CLR is an application virtual machine which gives services like security, memory management, and exception handling.