DOS (Disk Operating System)  :-

DOS is a single user operating system. It provides a common interface between the user and PC for the execution of programs. Because of the presence of DOS, application programs have a common way to get loaded into memory and get executed.

The DOS software comprises of three files :
   Ms-dos.sys
   IO.sys
   Command.com
First of all these files are loaded to the memory.

DOS Commands :

A command can be defined as something that you type when the curser is at the screen command line or DOS prompt.

There are mainly three type of commands :
   Internal commands
   External commands
   Batch file commands

Internal commands :-

Internal command are those are built in command.com of  any operating system for example  MD, RD, Copy, Del  so on.

External commands :-

External commands are those commands which use programs files with extensions .com and .exe.

Batch file commands :-
Batch file commands are commands mainly used in files with extension .bat.

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