The Windows Software Development Kit (SDK) contains headers, libraries, and tools you can use when you create apps that run on Windows operating systems. With the Windows SDK, you can begin building Universal Windows apps and desktop apps for Windows 10, Version 1511. This SDK also supports building Windows apps and desktop applications for Windows 8.1, Windows 8, Windows 7, Windows Vista, Windows Server 2012, Windows Server 2008 R2, and Windows Server 2008.