Models help to advertise a variety of products, including clothing, cosmetics, food, locations, and cars. Advertising can be by way of magazines, television, newspapers, catalogues, billboards, and online. Models must interact with a large number of people, so it is important to be polite, professional, prompt, and respectful. Almost all models work with agents, who provide a link between them and clients. Clients often prefer to work with agents, which makes it very difficult for a model to pursue a freelance career. Agents look for “fresh faces,” advise and train models, and promote them to clients in return for a portion of the model’s earnings.