Door knocking is a method used primarily in sales and marketing where individuals visit homes to engage potential customers directly. This approach allows representatives to introduce products or services, answer questions, and build personal connections with residents. In addition to sales, door knocking is often utilized in political campaigns, where volunteers visit neighborhoods to discuss candidates or issues. This face-to-face interaction can help gather support, inform voters, and encourage participation in elections, making it a valuable tool for both businesses and political organizations.