Microsoft

Windows OS, computer operating system (OS) developed by Microsoft Corporation to run personal computers(PCs).Featuring the first graphical user interface(GUI) for IBM-compatible PCs,the Windows OS soon dimated the PC market Approximately 90 percent of PCs run some version of Windows.

The first version of windows,released in 1985,was simply a GUI offered as an extension of Microsoft's existing disk operating system,or MS-DOS .Based in part on licensed concepts that Apple Inc had used for its Macintosh System Software, Windows for the first time allowed DOS users to visually navigate a virsual desktop,opening graphical"windows" displaying the contents of electronic folders and files with the click of a mouse button,rather than typing commands and directory paths at a text prompt.