Windows

What is Windows?
Windows is an operating system currently being developed by Microsoft (MSFT).

Windows 1.0
The very first Windows version was released as a graphical backend for MS-DOS in 1985, It was not received well and had Apple sue Microsoft for stealing graphical elements.

Bill Gates responded with that Apple also stole from Xerox the graphical UI.

Windows 3.1
This was the first version that sold well, and eventually set up Microsoft for dominance

Windows 10
This is the most recent and probably last version of Windows, as it is being updated continuously through Windows Update.