Microsoft .NET is a special platform aimed at helping developers create new applications for Windows.
Microsoft .NET Framework 4 features all the necessary components to develop and run .NET-based programs on your system: libraries, routines, utilities and other important elements.
Microsoft .NET Framework 4 is the latest version of the development platform, and includes important new features such as an optimized way to work with HTML and CSS, support for multi-touch management in Windows 7 and Surface 2.0 SDK, improvements in code debugging and more.
With Microsoft .NET Framework 4 you’ll be able to run the latest apps developed on the .NET Framework platform.
The download link leads to a Microsoft installer that downloads .NET Framework 4 from the Web.