Stands for “Graphical User Interface” used of colors to run the operating system such as icons, menu bar, lists etc., the GUI (pronounced as both G-U-I and gooey) was initially created at Xerox PARC by Alan Kay, Douglas Engel Bart, along with a number of other experts in 1981.

Apple launched the first available computer, the Lisa computer on January 19, 1983. A GUI uses symbols, windows, and selections to handle instructions for example removing files, opening files, and moving files.

A GUI may be designed for the requirements of a vertical market as application-specific graphical user interfaces. Examples include automated teller machines (ATM), point of sale (POS) touchscreens at restaurants,[9] self-service checkouts used in a retail store, airline self-ticketing and check-in, information kiosks in a public space, like a train station or a museum, and monitors or control screens in an embedded industrial application which employ a real-time operating system (RTOS).

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Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone.