Digital Audio Broadcasting, DAB, is audio that is broadcast typically through a radio.
DAB is where analog audio is converted into a digital signal. That signal is assigned to a particularly channel on either AM or FM frequency.
DAB dates back to the 1980s when the standard for it was initiated by a European research project.
The first launch of it was undertaken by the Norwegian Broadcasting Corporation in June 1995, while the BBC and Swedish Radio launched their own DAB radio broadcasts in September of the same year.