DOS stands for Disk Operating System, an operating system used to control personal computers that is stored on a disk and loaded into memory each time the computer is booted up or powered on. DOS is the software that performs the essential tasks needed to make a computer operate, such as storing and retrieving files, opening application programs, and receiving input from the keyboard and mouse. It allows many different types of software applications, such as games and word processing, to operate on the same computer.

There are many different types of DOS, such as PC-DOS, DR-DOS, and N-DOS. The most common version is MS-DOS (Microsoft Disk Operating System). MS-DOS was developed by the Microsoft Corporation and became the foundation of the Windows operating system that is used in most personal computers today.

MS-DOS was developed in the early 1980s when IBM was designing its version of the...