Online means being connected to the Internet or another similar network, like a bulletin board system. Some companies have online in their name, such as America Online. Although it sounds similar, online is not the same as on air. When one is online, one can receive and transmit information, whereas when one is on the air, one is broadcastingtelevision or radio signals.
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... was to promote the channel through their ordinary channels BBC1 and BBC2, using terrestrial signals, and this is seen by some as influential (to a certain limited ...