GUI or Graphical User Interface refers to an interface that allows one to interact with electronic devices like computers and tablets through graphic elements. It uses icons, menus, and other graphical representations to display information, as opposed to text-based commands. Important PointsRadio buttonIts main purpose is to allow the user to select a single option from a group of options from a predefined list of options. Radio buttons are often arranged in a group of at least two options. Radio buttons are so named because of their similarity to the circular buttons in old electronic devices, specifically old car radios where there were multiple physical buttons, but the user could only press one at a time. Additional Information. ScrollbarIt is an interaction technique or widget in which continuous text, pictures, or any other content can be scrolled in a predetermined direction (up, down, left, or right) on a computer display, window, or viewport so that all of the content can be viewed, even if only a fraction of the content can be seen on a device's screen at one time. It offers a solution to the problem of navigation to a known or unknown location within a two-dimensional information spaceProgress barIt tells the current status of the activity or task. The progress bar makes users feel that something is happening in response to their click and they need to wait. The PushButton This object displays a button with text or an image, which calls a function when pressed. ?Hence radio button is the GUI (Graphical User Interface) component used to select one from multiple alternatives.