AM and FM broadcasting is to all broadcasting type whereas internal radio can be one to one(uni-casting) or one to many(multicasting).
Internet radio is an audio broadcasting service transmitted via internet. Broadcasting on internet is usually referred as webcasting. Internet radio involves streaming medium that presents listeners with continuous stream of audio, using lossy audio codec. Streaming format includes MPs, Window Media Audio, Real audio.
Program produced by studio is feed to an encoder which compressors the audio and encodes for distribution over internet. Hardware or software encoding can be used.
The compressed stream is feed to server which copies the stream for each of the client. The service provider allocates certain bandwidth for the feed.
The data stream is transmitted over public internet where each data is broken into packets and distributed using internet protocol.
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