The term Tri-Cast refers to the simultaneous broadcasting of audio using the three methods of transmission FM broadcasting
FM broadcasting
FM broadcasting is a broadcasting technology pioneered by Edwin Howard Armstrong which uses frequency modulation to provide high-fidelity sound over broadcast radio. The term "FM band" describes the "frequency band in which FM is used for broadcasting"...

, online streaming
Internet radio
Internet radio is an audio service transmitted via the Internet...

 and podcast
A podcast is a series of digital media files that are released episodically and often downloaded through web syndication...

It is a concept employed by broadcasters and radio stations around the world to enhance listener flexibility.
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