Final answer:
An option button, or radio button, enables a user to select one of several options within a group. It is used in online forms for mutually exclusive choices and differs from checkboxes and drop-down menus.
Step-by-step explanation:
An option button, also known as a radio button, allows users to select one of several options within a group. When it comes to user interfaces, option buttons are commonly used to present a set of mutually exclusive choices. Only one selection can be made at a time, and clicking another option button within the same group will deselect the previously selected one.
Option buttons are distinctly different from checkboxes, which allow multiple selections. They are also separate from drop-down menus, which can either allow single or multiple selections and hide the available options until the user activates the menu.
An example of option button usage is in online forms, such as surveys or quizzes, where the user is prompted to select one answer from several choices.
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