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A person or company that conducts activities in order to acquire and retain customers or clients. This may include basic courtesies like returning phone calls and taking meetings. Very often, however, a marketer conducts large, expensive campaigns to encourage as many people as possible to buy a certain product. Marketing techniques in the latter instance include buying advertisements in the media, receiving endorsements from well-known experts and/or personalities, and generally aggressively pushing the product onto the target audience.