An option button is a control that represents a single choice within a limited set of mutually exclusive choices. That is, the user can choose only one of a series of options. Option buttons are sometimes called radio buttons because they function like the presets on old-fashioned mechanical radios, in which pushing buttons moves the needle that indicates the selected channel. Similarly, the user’s selection of an option button is indicated by a dot appearing in the button.
For tasks for which the user might select any combination of options, use a different type of control, such as check boxes.
For information about using option-button functionality in menus, see Menus.