Commercial broadcasting refers to the transmission of television and radio programs funded primarily through advertising revenue. This means that broadcasters sell airtime to advertisers who want to promote their products or services. The goal is to attract a large audience, which in turn increases the value of the advertising slots. In many countries, commercial broadcasting operates alongside public broadcasting, which is funded by government support or viewer subscriptions. Major networks, such as NBC, CBS, and ABC in the United States, are examples of commercial broadcasters that provide a variety of entertainment, news, and sports programming to the public.