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Unlike other forms of communication, such as editorial and news reporting, features articles in  magazines, news, and entertainment on radio and television, advertising is paid for by the advertiser, who, in turn, has control of what the public hears or sees, subject only to conditions set forth by the media carrying the message. The advertiser knows that the message will appear exactly as intended. On the other hand, advertisers generally take care to be sure that their advertising is truthful and does not mislead the public. Without advertising, there is little need for billboards, posters and most catalogs.
Advertising's importance to the communications industry is immeasurable. In fact, most of the media that we take for granted would be extremely expensive to the reader or viewer or would be out of business without the revenue produced by advertising.