Broadcasting - Because radio (RF) signals can radiate over a relatively large area, in a sense all radio is "broadcast". However, broadcasting usually refers to transmissions intended to be received by a wide group of listeners. (This excludes transmissions meant for selected listeners that just happen to be overheard by others.) Furthermore, although most of the earliest broadcasts used telegraphic dots and dashes for sending out things like weather forecasts to farmers and seagoing vessels, broadcasting is generally considered to be a form of radiotelephony (essentially voice), hence the transmission of information and entertainment in a readily understandable audio and/or visual form to the general public.