There are many definitions out there, but the term marketing is generally used to describe any and all communication activities designed to motivate a specific purchase or behavior. Marketing is the umbrella term that includes the 5 Ps of the marketing mix (positioning, product, price, place, promotion) as well as the sub-disciplines of advertising, public relations, sales, promotions, packaging, etc.

Size of audience exposed (See Exposure) to an advertisement through a particular Medium.