Door-to-door
Door-to-door is a canvassing technique that is generally used for sales, marketing, advertising, or campaigning, in which the person or persons walk from the door of one house to the door of another, trying to sell or advertise a product or service to the general public or gather information. People who use this sales approach are often known as traveling salesmen, or by the archaic name drummer (someone who "drums up" business), and the technique is also sometimes called direct sales. A variant of this involves cold calling first, when another sales representative attempts to gain agreement that a salesperson should visit.
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