What is "gui"

GUI (Graphical User Interface) is a type of user interface that allows interaction with digital devices through graphical elements as icons and other visual indicators, in contrast to the command line interface. It was created by Xerox but only became a product with Apple.

The interaction is usually done through a mouse and/or keyboard, with which the user is able to select symbols and manipulate them in order to obtain some practical result. These symbols are designated as widgets and are grouped into kits.

Graphical environment is software made to facilitate and make practical the use of the computer through visual representations of the operating system.