Radio button

A radio button is an element that allows only one option to be selected, but its functionality may not be so clear for the average user.

Radio button could be mistaken for a checkbox. It may also be confusing as of why the previously checked element is unchecked when the other one is selected.

To avoid this, an inside of the radio button (active part) could be moved around from previously to the next checked element in a continuous manner, that way clearly showing - there is only one selected option possible.