DOS : Disk Operating System

In the 1980s or early 1990s, the operating system that shipped with most PCs was a version of the Disk Operating System (DOS) created by Microsoft: MS-DOS.

DOS controls the computer’s hardware and provides an environment for programs to run. This system program must always be present when working with your computer. 

MS-DOS is a disk-based, single-user, single-task and character based user interface (CUI) operating system.



or follow below link for my blog
https://cdprajapati.blogspot.com/p/blog-page.html