Commercial radio and TV stations sell time. Companies who want you to buy something
from them pay the radio and TV stations for time, in increments of 10, 20, 30, and 60 seconds,
and use that time to broadcast their messages to you, encouraging you to buy their stuff.
Those messages are called "commercial announcements", or simply "commercials".
Commercials not only 'support' radio and television, but to any successful broadcast operation,
they bring in more than the cost to keep the station going. The extra is the station's profit, and
it is the reason that the radio and TV stations are on the air. The only sources of radio and TV
programing where profit is not the reason for their existence are Public broadcasting, campus
stations, experimental stations, and illegal 'pirate' stations.
jingle
jingle
A paid advertising message on TV or radio is a commercial.
It depends on the media (radio, television) and length of time.
Jingle (APEX)
A jingle
The word for a TV or radio ad is "commercial" (also the adjective form of commerce).
there were commercials way before TV, on the radio and banners
Public broadcasting is TV, Radio, etc funded by an official or governments, with No paid advertisements. Commercial broadcasting on the other hand is TV funded by paid advertisements and contain advertisements during the TV or radio times.
A jingle is a part of or can be the commercial. A jingle is a short, catchy song used in a radio or television commercial.
The correct spelling is "commercial" (used for business, or a TV/radio advertisement).
present everywhere