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The Windows XP graphical user interface.
The GUI on Windows 3.1.
A graphical user interface (GUI, often pronounced GOO-ee) is a user interface that incorporates graphical elements – such as windows, icons, visual indicators, and buttons – to facilitate interaction with electronic devices; unlike a command-line interface (CLI), which is text-based and require commands to be typed on a computer keyboard.
The first commercially available GUI was called "PARC", and was developed by Xerox for its 8010 Information System, released in 1981. Apple Inc. co-founder Steve Jobs saw the interface during a tour at Xerox and had his team develop an operating system with a similar design – Apple's Mac OS was released in 1984, with Microsoft's first GUI-based operating system, Windows 1.0, releasing the following year.[1]