Radio button is a visual control element used to allow users to make a single selection from a predefined set of mutually exclusive options. It is typically represented as a small circle, which is filled or highlighted when selected. Radio buttons are used in scenarios where all available options must be visible and a user is required to select exactly one.

Radio buttons are often grouped in radio button groups to clarify that the choices are mutually exclusive. By providing a clear, easy way for users to make single selections, the Radio button component contributes significantly to a streamlined, intuitive user experience.