A diplomat (from Ancient Greek: δίπλωμα; romanized diploma) is a person appointed by a state or an intergovernamental institution such as the United Nations or the European Union to conduct diplomacy with one or more other States or international organizations. The main functions of diplomats are: representation and protection of the interests and nationals of the sending State; initiation and facilitation of strategic agreements; treaties and conventions; promotion of information; trade and commerce; technology; and friendly relations. Seasoned diplomats of international repute are used in international organizations (for example, the United Nations, the world's largest diplomatic forum) as well as multinational companies for their experience in management and negotiating skills. Diplomats are members of foreign services and diplomatic corps of various nations of the world. Diplomats are the oldest form of any of the foreign policy institutions of a state, predating by centuries foreign ministers and ministerial offices. They usually have diplomatic immunity, and in their official travels they usually use a diplomatic passport or, for UN officials, a United Nations laissez-passer.