Direct-mail selling refers to a marketing tactic that involves sending promotional materials and offers directly to a target audience's mailbox. There are a few other terms that can be used as synonyms for direct-mail selling, including direct mail marketing, direct response marketing, and direct marketing. Direct mail marketing is a popular way for businesses to reach out to potential customers and create awareness about their products or services. Direct response marketing is a more targeted approach that encourages customers to take action, such as making a purchase or contacting the business for more information. Direct marketing, like direct-mail selling, involves reaching out to customers directly through various channels.