Graphical user interface

In computing, a graphical user interface (GUI,[1] sometimes pronounced "gooey")[2] is a kind of interface that allows users to interact with electronic devices through graphical icons and visual indicators such as secondary notation, as against text-based interfaces, typed command labels or text navigation. GUIs were introduced in reaction to the perceived steep learning curve of command-line interfaces (CLIs),[3][4][4] which need commands to be typed on the keyboard.The actions in a GUI are usually performed through direct modification of the graphical elements.[5] As well as computers, GUIs can be present in hand-held devices such as MP3 players, transportable media players, gambling devices and smaller household, office and industry equipment. The term "GUI" tends not to be applied to other low-resolution types of interfaces with display resolutions, such as video games (where HUD[6] is preferred), or not restricted to flat screens, like volumetric displays[7] because the term is restricted to the scope of two-dimensional display screens able to explain generic knowledge, in the custom of the computer science research at the PARC (Palo Alto Research Middle).