G

gigabyte

A gigabyte is 1,073,741,824 bytes, not a jillion.

GUI

Graphical user interface. An interface that uses a computer's graphical capabilities to make the computer easier to use. A GUI usually features menus and icons representing disks and files. Commands are sent to the computer via mouse clicks. The antithesis of a GUI is a command-line interface, where the user types in commands after a prompt, such as C:>. DOS and Unix use a command-line interface.