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Internet radio is radio streamed over the internet. The only difference with traditional radio is that the latter transmits wirelessly, and radios pick up the transmissions with antennae. This is not the case with internet radio as it is a webcast. No cables or aerials needed. The only prerequisites to enjoying radio over the internet are a PC, continuous internet connection and dedicated software to aid in the tuning. Internet radio, sometimes known as e-radio or web radio, does not involve any downloads, but rather, streaming. Because the options of pausing or rewinding are not availed, it is not totally comparable to file transfer. Internet radio is on air as long as there is an internet connection, and ceases to play as soon as the connection is broken.