How is marketing different than advertising and what indicators attest that marketing has matured as a legitimate function in the health care field? Advertising is the act of reaching the word out to consumers about a product or service. Marketing is the larger process of effectively selling products or services to the consumer from start to finish. Marketing may begin as early as the research and advancement stage and involves market investigate, product development, pricing, sales strategies, division, advertising and public relations. Advertising, therefore, is only one part of the marketing process.