A commercial traveller, also known as a REP, is a person who travels to different locations to promote and sell products or services. A REP typically visits customers, attends trade shows, and provides customer service. A DRUMMER is a type of commercial traveller who sells goods by travelling from place to place. They are usually employed by a company to promote their products and services. A SALESMAN is another type of commercial traveller who sells goods or services to customers. They may work in a store or travel to customers' homes or businesses to make sales.