Microsoft Windows is a group of several graphical operating system families, all of which are developed, marketed, and sold by Microsoft. Each family caters to a certain sector of the computing industry. Active Windows families include Windows NT and Windows Embedded; these may encompass subfamilies, e.g. Windows Embedded Compact (Windows CE) or Windows Server. Defunct Windows families include Windows 9xWindows Mobile and Windows Phone.
Microsoft Windows

Microsoft
Source model
Initial release
November 20, 1985; 33 years ago, as version 1.0 (Unsupported)
1809 (10.0.17763.134) November 13, 2018 (3 months ago)
1903 (10.0.18282) November 14, 2018 (3 months ago)
Marketing target
Personal computing
138 languages[1]
Update method
Windows Installer(.msi), Windows Store(.appx)[2]
Platforms
ARMIA-32Itaniumx86-64DEC AlphaMIPSPowerPC
Kernel type
Default user interface
Windows shell
Proprietarycommercial software
Official website
windows.microsoft.com
Microsoft introduced an operating environment named Windows on November 20, 1985, as a graphical operating system shell for MS-DOS in response to the growing interest in graphical user interfaces (GUIs).[3]Microsoft Windows came to dominate the world's personal computer (PC) market with over 90% market share, overtaking Mac OS, which had been introduced in 1984. Applecame to see Windows as an unfair encroachment on their innovation in GUI development as implemented on products such as the Lisa and Macintosh (eventually settled in court in Microsoft's favor in 1993). On PCs, Windows is still the most popular operating system. However, in 2014, Microsoft admitted losing the majority of the overall operating system market to Android,[4]because of the massive growth in sales of Android smartphones. In 2014, the number of Windows devices sold was less than 25% that of Android devices sold. This comparison however may not be fully relevant, as the two operating systems traditionally target different platforms. Still, numbers for server use of Windows (that are comparable to competitors) show one third market share, similar to that for end user use.
As of October 2018, the most recent version of Windows for PCs, tabletssmartphonesand embedded devices is Windows 10. The most recent versions for server computers is Windows Server 2019A specialized version of Windows runs on the Xbox One video game console.[5]