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Earlier discussion
2 older comments kept for context.
Oluwaseun Adeyemi
Short for Microsoft Disk Operating System, MS-DOS is a non-graphical command line operating system derived from 86-DOS that was created for IBM compatible computers. MS-DOS originally written by Tim Paterson and introduced by Microsoft in August 1981 and was last updated in 1994 when MS-DOS 6.22 was released. The year 1980 in this NECO past questions is the closest to the actual documented year, which is 1981. MS-DOS allows the user to navigate, open, and otherwise manipulate files on their computer from a command line instead of a GUI like Windows.
Jamilu Salisu
Initial release was August 12, 1981 and the last update was DOS 8.0, September 2000. Thanks for the explanation too.