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XNA Game Studio 4.0 is a programming environment that allows you to use Visual Studio 2010 to create games for Windows Phone, the Xbox 360 console, and Windows-based computers. XNA Game Studio 4.0 includes the XNA Framework 4.0, which is a set of managed libraries designed for game development based on Microsoft .NET Framework 4.
The XNA Framework Redistributable provides the necessary runtime components to execute a game on Windows that was developed using Microsoft XNA Game Studio 4.0. This release contains improved functionality as well as new features. Installation of this runtime is unnecessary on systems with Microsoft XNA Game Studio 4.0 already installed. The Microsoft Software License Terms for Microsoft XNA Game Studio 4.0 covers the terms under which developers may use the Redistributable. For full details, review the Microsoft XNA Game Studio 4.0 license terms.