Direct mail advertising refers to the process of delivering advertisements via the local postal service.

Direct mail advertising uses postal mail to deliver your company’s ad directly to a potential buyer’s mailbox. This can take the form of a flyer, brochure, postcard, or coupons, designed by you and delivered to your desired audience.

Direct mail advertising reaches prospects, buyers, and customers year-round in a convenient, accessible location. This can be a cost-efficient strategy and can directly lead to sales when executed with a strong design and a clear, compelling call-to-action. 

References

https://en.wikipedia.org/wiki/Advertising_mail

https://www.encyclopedia.com/social-sciences-and-law/economics-business-and-labor/businesses-and-occupations/direct-mail-advertising

https://mailchimp.com/marketing-glossary/direct-mail/