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GUI
From HalfLife 2 Knowledge Base
Acronym: Graphical User Interface
A GUI is just as its name implies: a graphics-based interface for end-users (those for whom a piece of software is developed). Typically, GUI's are made up of any combination of buttons, pull-down/multi-level/context menus, sliders, and text fields. However, any combination of graphical elements (save the simple display of text alone) that serves as an interface indended for end-users can be considered a GUI.
The most commonly known alternative to a GUI is a command-line interface, such as a Unix shell or DOS prompt. The Developer Console in Source applications is another example of a command-line interface.
