What is the purpose of advertising?

Advertising is a form of marketing communication that is used to promote or sell products, services, or ideas. The purpose of advertising is to attract the attention of potential customers and persuade them to purchase a product or service, or to support a cause or idea. Advertising can be used to inform people about a new product or service, to remind them about an existing product or service, or to compare a product or service to others in the market. It can also be used to create or maintain a positive image for a brand or organization. Advertising can be done through a variety of mediums, including print, television, radio, online, and outdoor, and can be targeted to specific groups of people based on factors such as age, gender, location, interests, and behavior.