Services are acts that are intangible and do not result in ownership. They can be a minor or major part of an offering combined with goods. Services are categorized based on whether equipment or people are used to deliver them, if the client must be present, and if they meet personal or business needs. Key characteristics of services include intangibility, inseparability of production and consumption, variability in quality, and perishability if not used. Managing demand and supply helps address the perishability challenge.