What is a GUI?

GUI is an acronym for "graphical user interface", such as Mac OS, Mac OS X, Microsoft Windows, and the X Window System. A GUI lets you interact with your computer using pictures and symbols, rather than having to memorize many complicated commands and type them precisely, as with a command-line interface such as DOS. Most computer users today become familiar with using GUIs before using any other type of interface.

Also see:

• In graphical user interfaces, what are handles?
• What is the X Window System?
• What is Mac OS X?
• Basic mouse clicks using a two-button mouse