When was windows the operating system made?

Answer 1

got this answer from the wikipedia

Microsoft introduced an operating environment named Windowson November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces (GUIs).[2] Microsoft Windows came to dominate the world'spersonal computer market, overtaking Mac OS, which had been introduced in 1984. As of August 2011, Windows has approximately 82.58% of the market share of the client operating systems according to Usage share of operating systems.