The purpose of advertising is to promote a product, service, or brand to a target audience in order to increase sales and brand awareness. Advertising can be done through a variety of mediums, including television, radio, print, digital, and outdoor. Advertising can be used to inform, persuade, and remind potential customers of a product or service. It can also be used to create a positive image of a brand or company. Advertising can be used to reach a wide range of audiences, from local to global.