In the primary and secondary sectors, goods are manufactured, while in the tertiary sector, goods are not produced or manufactured, but services are provided. The activities of the tertiary sector help in the development of the primary and secondary sectors. For example, goods produced in the primary and secondary sectors are taken from one place to another by trucks and trains and sold in the market, etc., by the tertiary sector. Banks, telephones, insurance companies are needed in the activities of the primary and secondary sector. All these are examples of the tertiary sector. Thus the tertiary sector provides services which are used for the development of primary and secondary sector activities.