What is Microsoft Windows?

A family of operating systems for personal computers. Windows dominates the personal computer world, running, by some estimates, on 90% of all personal computers. The remaining 10% are mostly Macintosh computers. Like the Macintosh operating environment, Windows provides a graphical user interface (GUI), virtual memory management, multitasking, and support for many peripheral devices.

See: Windows 95, Windows 98, Windows NT, Windows 2000, Windows XP, Windows 2003, Windows Vista, Windows Server 2008