what is the dos
Stands for Disk Operating System. DOS was the first operating system used by IBM-compatible computers. It was originally available in two versions that were essentially the same, but marketed under two different names. PC-DOS was the version developed by IBM and sold to the first IBM-compatible manufacturers. MS-DOS was the version that Microsoft bought the rights to, and was bundled with the first versions of Windows. DOS uses a command line, or text-based interface, that allows the user to type commands. By typing simple instructions such as pwd (print working directory) and cd (change directory), the user can browse the files on the hard drive, open files, and run programs.