what radio

Radio is a technology that allows the broadcasting of audio, sometimes with related metadata, by radio waves to radio receivers belonging to a public audience. Radio broadcasting takes several forms, including AM and FM stations, and there are several subtypes, such as commercial broadcasting, non-commercial educational (NCE) public broadcasting, and non-profit varieties, as well as community radio, student-run campus radio stations, and hospital radio stations that can be found throughout the world. AM and FM stations are government-licensed, and many stations broadcast on shortwave bands using AM technology that can be received over thousands of miles (especially at night) . In addition, there are commercial radio stations, such as WHAT (1340 kHz) in Philadelphia, Pennsylvania, which airs a Spanish-language contemporary hit and reggaeton format). Listeners can also stream radio stations online, such as WHAT?! Radio, which is a hip hop station.