This paper studied the history of diplomacy. First, has given definition of diplomacy in general. Secondly, attempted an explanation of history of diplomacy, comparing during centuries. Thirdly, diplomacy analyzed by focusing on diplomatic institution and main types of diplomacy which make possible the implementation of foreign policy of a country. Finally the study concluded on what is and what a state can do, realize and implement its foreign policy through good diplomacy which is always an instrument of good governance.