What is UI?

 What is UI? User Interface Command Line Menu Driven Commands
UserInterface

     The junction between the users and a computer programs. An interface is a set of commands or menus through which a user communicates with a program. A command-driven interface is one in which you enter commands. A menu-driven interface is one in which you select command choices from various menus displayed on the screen. The UserInterface is one of the most important parts of any program because it determines how easily you can make the program do what you want. Graphical UserInterfaces (GUIs) that use icons, pop-up menus and the mouse have become the standard on personal computers.

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 What is UI? User Interface Command Line Menu Driven Commands