Advertising is a form of communication whose purpose is to inform potential customers about products and services and how to obtain and use them. Many advertisements are also designed to generate increased consumption of those products and services through the creation and reinforcement of brand image and brand loyalty. For these purposes advertisements often contain both factual information and persuasive messages. Every major medium is used to deliver these messages, including: television, radio, movies, magazines, newspapers, video games, the Internet, and billboards. Advertising is often placed by an advertising agency on behalf of a company