Microsoft XNA (a recursive acronym for XNA's Not Acronymed) is a freeware set of tools with a managed runtime environment provided by Microsoft that facilitates video game development and management. XNA is based on the .NET Framework, with versions that run on Windows NT, Windows Phone and the Xbox 360. XNA content is built with the XNA Game Studio, and played using the XNA Framework (for Windows games), or published as native executables (for Xbox 360, Windows Phone and Zune).