Graphical+User+Interface

=Graphical User Interface= Abbreviated GUI, was a breakthrough in making the computer more user friendly. Prior to the use of a GUI, the only way to control a computer was through a command line interface. Mac OS and Windows are examples of a GUI. It uses icons and graphics to control the computer with a mouse or other input device.

Xerox PARC was developing a GUI in the early 80's when Steve Jobs saw it demonstrated at the Xerox PARC facilities. He knew this was the way to make the "Computer for the rest of us." He "borrowed" the idea and it became the first Mac OS. Later, Microsoft "borrowed" the idea from Apple to make Windows.