A checkbox (check box, tickbox, tick box) is a GUI widget that permits the user to make a binary choice, i.e. a choice between one of two possible mutually exclusive options. For example, the user may have to answer 'yes' (checked) or 'no' (not checked) on a simple yes/no question.
Checkboxes are often shown on the screen as a square box that can contain white space (for false) or a tick mark or × (for true), as shown ( ? or ?, respectively). A caption describing the meaning of the checkbox is normally shown adjacent to the checkbox. Inverting the state of a checkbox is done by clicking the mouse on the box, or the caption, or by using a keyboard shortcut, such as the space bar.
Often, a series of checkboxes are presented, each with a binary choice between two options. Then the user may select several of the choices. Compare this to a radio button, in which only a single option is selectable from several mutually-exclusive choices.
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