An interface term.
If you use a command line interface, for example in Windows open Accessories->Command Prompt, you will see a black window and a line within the window something like this:
and the dashed line is blinking. This is the 'Command Prompt'. It shows where the text you type will appear and shows that the computer is expecting you to enter a command or 'prompt'.
In Linux, you can open a 'shell' session and once again you will see the command prompt within that window.
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: Command Line Interface