What is MS-DOS?

MS-DOS is an operating system developed by Microsoft. It is a non-graphical command-line based operating system developed for x86-based computers. Released in the year of 1981, MS-DOS was originally written by Tim Paterson. Though not used by many today, MS-DOS was one of the popular operating systems throughout the 1980s. MS-DOS is a closed-source operating system that features a monolithic kernel.

The first Windows with GUI used M-DOS as the underlying basic operating system. This command-line based system was preferred for its flexibility and stability, but the rise of the GUI based operating system led to its inevitable downfall.