or sales rep or salesman or salesperson - someone who contacts existing and potential customers, and tries to persuade them to buy goods or services.

a person acting as an independent contractor to sell goods or services on behalf of a manufacturer or distributor

a person or company who is the main point of contact for customers

A salesperson; an individual employed to sell goods on behalf of a producer or some other member of a marketing channel by contacting prospective customers and developing in them an interest in the company's products.

(or sales rep): A member of the publisher's sales force or an independent contractor who, armed with a book catalog and order forms, visits bookstores in a certain territory to sell books to retailers.