Internet radio
Internet radio is a broadcasting service transmitted via the Internet. Not every internet "radio station" has a corresponding traditional radio station. Many internet radio stations are completely independent from traditional ("terrestrial") radio stations and broadcast only on the Internet. Broadcasting on the Internet is usually referred to as webcasting since it is not trasmitted broadly through wireless means but is delivered over the World Wide Web. e-Radio suggests a streaming media that presents listeners with a continuous stream of audio to which they have no control much like traditional broadcast media. It is not synonymous with podcasting which involves downloading and therefore copyright issues. Nor does e-Radio suggest "on-demand" file servering.
Because the radio signal is relayed over the Internet....