A diplomat is a person appointed by a state to conduct diplomacy with one or more other states or international organisations. 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 organisations (e.g. United Nations) 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 the state, predating by centuries foreign ministers and ministerial offices. They usually have diplomatic immunity.
The regular use of permanent diplomatic representation began between the states of fifteenth-century Italy. However the terms ‘diplomacy’ and ‘diplomat’ appeared in the French Revolution. Diplomat is derived from the Greek διπλωμάτης (diplōmátēs), the holder of a diploma, referring to diplomats' documents of accreditation from their sovereign.
Diplomats themselves and historians often refer to the foreign ministry by its address: the Ballhausplatz (Vienna), the Quai d’Orsay (Paris), the Wilhelmstraße (Berlin); and Foggy Bottom (Washington). For imperial Russia to 1917 it was the Choristers’ Bridge (St Petersburg). The Italian ministry was called "the Consulta."
Though any person can be appointed by a state's national government to conduct said state's relations with other states or international organisations, a number of states maintain an institutionalised group of career diplomats—that is, public servants with a steady professional connection to the country's foreign ministry. The term career diplomat is used worldwide in opposition to political appointees (that is, people from any other professional backgrounds who may equally be designated by an official government to act as diplomats abroad). While officially posted to an embassy or delegation in a foreign country or accredited to an international organisation, both career diplomats and political appointees enjoy the same diplomatic immunities. Cerimonial heads of state commonly act as diplomats on behalf of their nation, usually following instructions from their head of Government.