Microsoft Windows, commonly known as Windows, is a proprietary graphical operating system developed and marketed by Microsoft. It is grouped into families that cater to particular sectors of the computing industry – Windows for personal computers, Windows Server for servers, and Windows IoT for embedded systems. Windows itself is further grouped into editions that cater to different users – Home for home users, Professional for advanced users, Education for schools, and Enterprise for corporations. Windows is sold both as a consumer retail product and to computer manufacturers, who bundle and distribute it with their systems. The first version of Windows, Windows 1.0, was released on November 20, 1985 as a graphical operating system shell for MS-DOS in response to growing interest in graphical user interfaces (GUIs). The name Windows is a reference to the windowing system in GUIs. The 1990 release of Windows 3.0 catapulted its market success and led to the launch of various other product families, including the (now-defunct) Windows Mobile, Windows Phone, and Windows CE/Embedded Compact. Windows is the most popular desktop operating system in the world, with a 72% market share as of October 2025, and the second-most popular operating system overall, behind Android. As of August 2025, Windows 11 is the most used desktop version of Windows, with a market share of 53%. Source: Wikipedia (en)