Various versions of Microsoft's Windows operating system have existed since the 1980s. While the operating system got its start on personal computers, today, versions of Windows are available for a ...

An operating system is the essential software that's needed to run your computer's suite of software. Everything from video ...

The computer's master control program. When a computer is turned on, a small "boot program" loads the operating system. Although additional system modules may be loaded as needed, the main part, known ...