Selecting a radio button is done by clicking the mouse on the button, or the caption, or by using a keyboard shortcut. The choices are mutually exclusive when the user selects a radio button, any previously selected radio button in the same group becomes deselected (making it so only one can be selected). Each radio button is normally accompanied by a label describing the choice that the radio button represents. Radio buttons are arranged in groups of two or more and displayed on screen as, for example, a list of circular holes that can contain white space (for unselected) or a dot (for selected). The singular property of a radio button makes it distinct from a checkbox, which allows more than one (or no) item to be selected and for the unselected state to be restored. A radio button or option button is a graphical control element that allows the user to choose only one of a predefined set of mutually exclusive options.
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