Advertising is communication respecting trade which provides information regarding products and services as well as emotional inducements to engage in trade.
Advertising is sold, particularly by providers of information and entertainment, to sellers of goods and services and included with information and entertainment. Thus, in many instances, valuable services are provided gratis to consumers. Sellers, and specialized providers of advertisements, attempt to target consumers who might be be willing and able to buy the products. Thus Google presents advertisements related to the subject of web searches or the subject of news or information.
Advertising is frequently badly off target from a consumer's perspective.