A radio personality is a person who has an on-air position in radio broadcasting. A radio personality who hosts a radio show is also known as a radio host, radio presenter or radio jockey. Radio personalities who introduce and play individual selections of recorded music are known as disc jockeys or "DJs" for short. Broadcast radio personalities may include talk radio hosts, AM/FM radio show hosts, and satellite radio program hosts, and non-host contributors to radio programs, such as reporters or correspondents.

Radio broadcasting is the broadcasting of audio (sound), sometimes with related metadata, by radio waves to radio receivers belonging to a public audience. In terrestrial radio broadcasting the radio waves are broadcast by a land-based radio station, while in satellite radio the radio waves are broadcast by a satellite in Earth orbit. To receive the content the listener must have a broadcast radio receiver (radio). Stations are often affiliated with a radio network that provides content in a common radio format, either in broadcast syndication or simulcast, or both. Radio stations broadcast with several different types of modulation: AM radio stations transmit in AM, FM radio stations transmit in FM, which are older analog audio standards, while newer digital radio stations transmit in several digital audio standards: DAB, HD radio, DRM.