"Direct marketing is a form of communicating an offer, where organizations communicate directly to a pre-selected customer and supply a method for a direct response. Among practitioners, it is also known as direct response marketing. By contrast, advertising is of a mass-message nature.
Response channels include 800-numbers, reply cards, reply forms to be sent in an envelope, websites and email addresses.
The prevalence of direct marketing and the unwelcome nature of some communications has led to regulations and laws such as the CAN-SPAM Act, requiring that consumers in the United States be allowed to opt-out." - (en.wikipedia.org 31.12.2020)
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