Abbreviation for Character User Interface.
An application that operates only with letters. It can be seen at the command prompt. Interactive processing. Not often used these days.
ex
Press Enter at the command prompt with ver to move to a new line.
Abbreviation for Graphical User Interface.
An input method in which buttons and input fields are displayed and operated with the mouse or touch. The display of the personal computer that you usually see is also GUI.
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