2.DM is an omitted expression of English direct mail advertisement, which is also expressed as magazine direct mail advertisement. The Basic Knowledge of National Advertising Vocational Qualification Training Textbooks published by the State Administration for Industry and Commerce 1995 defines DM as direct marketing advertisement.
3.DM advertising is a very flexible form of advertising media. The key point is that it must be specific to a specific group of people. Its ideological core lies in the accurate measurement of results, that is, it is a more personalized marketing tool.
4.DM advertising is a very unstable advertising form. Because the response time of purchasing information is long, it is not easy to attract consumers' strong attention and quick response quickly, and it is easy to cause the phenomenon of littering.