Direct Mail, or Direct Mail Marketing is the process of sending a physical piece of printed promotional material through the mail via the USPS directly to a home or business. Types of direct mail marketing include postcards, flyers, catalogs, brochures, invitations, newsletters, and coupon mailers. When mailing, advertisers can use a saturation list to target carrier routes within an entire neighborhood, or they can opt for a more targeted resident list and use demographic filters such as income, household makeup, etc.