What's the .NET FrameWork?As defined by an official Microsoft Source,"the Microsoft .NET Framework is a platform for building, deploying, and running Web Services and applications.
It provides a highly productive, standards-based, multi-language environment for integrating existing investments with next-generation applications and services as well as the agility to solve the challenges of deployment and operation of Internet-scale applications. The .NET Framework consists of three main parts: the common language runtime, a hierarchical set of unified class libraries, and a componentized version of Active Server Pages called ASP.NET".
This is the logo of the first release of the .NET Framework, released on 13 February 2002 and available for Windows 98, Me, NT 4.0, 2000, and XP. Mainstream support by Microsoft for this version ended 10 July 2007 (source: http://en.wikipedia.org/wiki/.NET_Framework).