An Online Radio Station is the new media for listening to music.
So instead of transmitting a signal to a radio receiver like a terrestrial, or non online radio station, an Online Radio Station streams data over the internet containing the sound information.
Then any online device such as a Smartphone, PC or a SmartTV can pick up the stream from anywhere in the world.
but internet radio services—the kind where you press play, sit back, and enjoy music that you know you'll love and only interact if you hear something you don't—are a rarer breed. Sometimes you're in the mood to just listen to music, not be a DJ.