CBS is one of the four big national television networks in the United States. The name first stood for Columbia Broadcasting System, from the days when it was a radio company; people still write CBS, but almost nobody says the long name out loud any more. The other three main US networks are ABC, Fox, and NBC. A network here means a company that makes programmes and sends them to local stations all over the country, so many cities watch the same news or the same drama on the same night. Older Americans still talk about “the three networks” — ABC, CBS, and NBC — because Fox became a full national network later; today people usually name four. CBS is famous in America for news, sport, and long-running shows. It is an American proper name, not a Taiwanese channel, though you may still see the letters on news clips. Say it letter by letter: C-B-S.