It is a set of commands or actions that an operating system can perform and a way for a program or person to activate them.
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User Interface
An operating system is a main program that serve as an interface between the users and the application programs.
A user interface (UI) is the part of an operating system, program or device that the user uses to input and receive data
user interface
The 'shell' is a user interface program that interfaces between a user of the system and the Operating System. It is the user interface.