A GUI (Graphical User Interface) allows users to interact with electronic devices like computers and handheld devices through icons and visual indicators rather than text commands. GUIs use direct manipulation of graphical elements. While originally developed for 2D screens, the concept of a GUI could apply to non-standard interfaces like games or volumetric displays. GUIs simplify program development and make programs easier and faster to use, even for novice programmers. Common GUI elements include buttons, radio buttons, checkboxes, text boxes, and list boxes.