A radio broadcast is a TRANSMISSION of audio content over the airwaves, usually for entertainment or educational purposes. It is typically transmitted through radio waves, which are electromagnetic waves that travel through the air at the speed of light. Radio broadcasts can be heard on radios, televisions, and other electronic devices. The term 'radio broadcast' is often used interchangeably with 'broadcast radio, ' which is a type of radio station that transmits audio content to a wide audience.