THREE TYPES OF INTERFACES
COMMAND LINE INTERFACE (CLI)
The command line interfaces is one of the oldest interfaces. It works by the operator typing commands, then the interface will carry out the commands. This interface requires extensive knowlege of different comands and isn't an ideal interface.
GRAPHICAL USER INTERFACE (GUI)
This interface uses icons, windows, and menus, making it easier to carry out commands. You usually need a key board and mouse to be able to click on the icons to carry out the commands.