Short Definition
A user interface element that allows users to select one option from a list of mutually exclusive options. Unlike checkboxes, only one radio button can be selected at a time.
Relevance
Radio buttons allow users to select one option from a group. For accessibility, they must be clearly labeled and navigable by keyboard. By understanding radio buttons, you can guide others on how to make a single choice from multiple options, especially when they are unfamiliar with how to navigate forms using different screen setups or assistive devices.