There are two types of command in MS-Dos:

• Internal Commands: These are built-in functions of Ms-DOS Operating System, It can be used directly from cmd. Examples include `DIR`, `CD`, `CLS`, `TIME`, and `DATE`.
• External Commands: These commands are stored in separate executable files (.exe) and require their own files to run. When you type an external command, MS-DOS loads the corresponding program into memory. ...