Marketing & Sales - a definition. Marketing is not advertising. Marketing is finding out what people want, why they want it and how much they'll spend. Don't confuse marketing with advertising. Advertising is the promotion of a service or product or company. Marketing and sales. Marketing is the process of identifying, anticipating and then meeting the needs and requirements of consumers in order to make a profit. In contrast, selling involves persuading customers that your products or services provide the benefits that they are looking for. A marketing idea that is based only on the selling of goods or services, rather than on whether or not they are actually needed. Also called the selling concept.