The document defines and discusses the tertiary sector. It provides examples of: - Public services which are managed by the state, such as health systems. - Private services which are offered by private companies in order to make a profit, such as banks and lawyers. - Different types of services classified according to their role in society, such as social, administrative, financial, cultural, and personal services. The document also discusses domestic and international trade, as well as different types of retail establishments where consumers can purchase goods like supermarkets, department stores, shopping centers, and online/mail order sales.