GUI

Stands for "Graphical User Interface." The acronym is pronounced "gooey", not "gwi" or "gwee". It allows computer users to interact with their system by using a mouse instead of by typing in text at a command line. The two most popular operating systems -- Windows and the Mac OS -- are GUI based. The idea of a graphical user interface was first introduced by Apple with the Macintosh in 1984, but the idea was actually stolen from Xerox by our pal, Steve Jobs.