Penguin
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Acronym for Graphical User Interface.

A GUI normally involves the WIMP paradigm (Windows, Icons, Mouse, Pointer) and provides a nice graphical (higher resolution) way of looking at data.

Purists use GUIs only to run multiple copies of xterm(1)

Compare with CommandLine.

One of the downsides about MicrosoftWindows is that the GUI is built into the OperatingSystem. Conversely, Linux provides any number of GUI interfaces; most of which use TheXWindowingSystem - look up GNOME or KDE for some GUI DesktopEnvironments?.