A radio choice is a small round control used when someone must choose one option from a group. Picking one usually clears the previous choice. It works like selecting one station on a simple dial: you can listen to one station at a time.
For example, a delivery form might ask whether a package should arrive by “Standard,” “Express,” or “Pick up.” If the person can choose only one, radio choices make that rule visible.
Show the choices together and give each one a plain label. If there are only two options that switch a setting on or off, a checkbox or switch may be easier to understand.