A checkbox (check box, tickbox, tick box) is a graphical widget that allows 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.
To select a check box or place a check in the check box with a computer mouse, click the check box with the left mouse button. To check a check box with a touch screen, tap your finger on the check box. If a box is checked, it can be unchecked by clicking or tapping the box again.