Direct mail refers to a marketing or advertising method that involves sending promotional materials directly to individuals or businesses through physical mail. Direct mail is also referred to as "direct mail marketing" or "direct mail advertising." This advertising method uses targeted lists of addresses and personalization to reach potential customers, generating sales, leads, or brand awareness. Direct mail can take many forms, including postcards, catalogs, flyers, letters, or samples. Direct mail is often used in conjunction with other marketing channels, such as email, social media, and online advertising.