Terrestrial radio uses land-based stations and antennas to broadcast music and news programs to listeners. Digital audio broadcast transmits digital signals on specific channels so listeners know which radio station to tune into for different frequency programs. Broadcasts can be live without delays, as-live with small delays to allow censoring, or recorded programs from earlier including music, speech, commercials, dramas, and other formats. Non-broadcast products include podcasts which are downloadable audio files, internet radio which transmits over the internet, and in-store audio used for advertising inside retail stores.

1. Broadcast products
Terrestrial radio: Terrestrial radio is land based stations that
provides listeners with music and news. Terrestrial radios use
antennas to get the signal.
Digital audio broadcast (DAB): Digital audio broadcast is a digital
signal transmitted to a specific channel. The programmes have
different frequencies as needed so listeners know which radio to
tune into.
Form
Live: live broadcast is a programme broadcasted live with no delays.
For example the nick Grimshaw breakfastshow.
As-live: As-live broadcast is broadcast played as if it was live, but it
has a little delay to allow the broadcaster to sensor it out because of
swearing.
Recorded: Recorded broadcast is a programme that has been
recorded earlier.
Music and speech programme: A programme that uses both
speech and music.

2. Commercials: Commercial broadcast is the broadcast used to
advertise TV programmes, radio programmes or products.
Drama: when plays or soap operas are broadcasted on the radio for
example the archers.
Non-broadcast products
Podcast: a digital audio file made available on the internet for
downloading to a computer or a portable music player.
Internet radio: internet radio is an audio service transmitted via
internet.
In-store audio:in-store media - Advertising and promotional media
that are used inside of a retail store such as point-of-purchase
displays, ads on shopping carts.