A radio personality (American English) or radio presenter (British English), commonly referred to as a "disc jockey" or "DJ" for short, 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, and in India and Pakistan as a radio jockey. Radio personalities who introduce and play individual selections of recorded music are known as disc jockeys. The term has evolved to also describe a person who mixes a continuous flow of recorded music in real time. Broadcast radio personalities may include talk radio hosts, AM/FM radio show hosts, and satellite radio program hosts.
Notable radio personalities include pop music radio hosts Martin Block, Dick Clark, Casey Kasem, Delilah Luke, Alan Freed, Ameen Sayani, Herb Kent, and Wolfman Jack; shock jocks such as Don Imus and Howard Stern; sports talk hosts such as Mike Francesa; and political talk hosts such as Rush Limbaugh.
A radio personality can be someone who introduces and discusses genres of music; hosts a talk radio show that may take calls from listeners; interviews celebrities or guests; or gives news, weather, sports, or traffic information. The radio personality may broadcast live or use voice-tracking techniques. Increasingly in the 2010s, radio personalities are expected to supplement their on-air work by posting information online, such as on a blog or on another web forum. This may be either to generate additional revenue or connect with listeners. With the exception of small or rural radio stations, much of music radio broadcasting is done by broadcast automation, a computer-controlled playlist airing MP3 audio files which contain the entire program consisting of music, commercials, and a radio announcer's pre-recorded comments.
In the past, the term "disc jockey" (or "DJ") was exclusively used to describe on-air radio personalities who played recorded music and hosted radio shows that featured popular music.  Unlike the modern club DJ who uses beatmatching to mix transitions between songs to create continuous play, radio DJs played individual songs or music tracks while voicing announcements, introductions, comments, jokes, and commercials in between each song or short series of songs. During the 1950s, '60s and '70s, radio DJs exerted considerable influence on popular music, especially during the Top 40 radio era, because of their ability to introduce new music to the radio audience and promote or control which songs would be given airplay.
Radio personality salaries are influenced by years of experience and education. In 2013, the median salary of a radio personality in the US was $28,400.
A radio personality with a bachelor's degree had a salary range of $19,600-60,400.
The salary of a local radio personality will differ from a national radio personality. National personality pay can be in the millions because of the increased audience size and corporate sponsorship. For example, Rush Limbaugh was reportedly paid $40 million annually as part of the eight-year $400 million contract he signed with Clear Channel Communications.
Due to radio personalities' vocal training, opportunities to expand their careers often exist. Over time a radio personality could be paid to do voice-overs for commercials, television shows, and movies.
Universities offer classes in radio broadcasting and often have a college radio station, where students can obtain on-the-job training and course credit. Prospective radio personalities can also intern at radio stations for hands-on training from professionals. Training courses are also available online.
Many radio personalities do not have a post-high school education, but some do hold degrees in audio engineering. Radio personalities typically have a bachelor's degree level qualification in radio-television-film, mass communications, journalism, or English.