The document discusses the marketing mix, which is defined as the set of controllable tactical marketing tools that a firm uses to influence demand for its products. The traditional marketing mix consists of the 4 Ps - Product, Price, Place, and Promotion. An extended marketing mix was introduced to accommodate services, adding the three Ps of People, Physical Evidence, and Process. An effective marketing mix matches customer needs, creates a competitive advantage, is well-blended, and matches a company's resources. The marketing mix elements are interdependent and must be carefully adjusted to achieve desired results.