This document discusses service marketing. It defines services as activities, benefits, and satisfactions offered for sale or provided with the sale of goods. Service marketing focuses on relationships and value. There are two main types of services: core services, which are the primary purpose of a transaction, and supplementary services, which are rendered alongside a tangible product. Compared to goods, services are intangible, heterogeneous, simultaneously produced and consumed, and cannot be stored or resold. The document outlines challenges in marketing services and additional marketing mix elements for services, including physical evidence, process, and people. It provides examples of service industries like healthcare, professional services, and hospitality.