User interface is the mediator between user and hardware machine.
Types of user interface
1. Command Line Interface (CLI):-
This type of interface provides a command prompt to operate and manage the system. In this we have to specify every operation as a command at command prompt. Eg: MS-DOS.
2. Graphical User Interface (GUI):-
GUI provided a graphical platform for operations. In this interface display all program as a “ICON”. To work with any program just open the symbol by clicking. We can easily identify any program by icon style. Eg: WINDOWS.