The Office of United States Director of Central Intelligence (DCI) was the head of the United States Central Intelligence Agency, the principal intelligence advisor to the President and the National Security Council, and the coordinator of intelligence activities among and between the various United States intelligence agencies (collectively known as the Intelligence Community since 1981). The office existed from January 1946 to April 2005 and was replaced by Director of National Intelligence (DNI) and Director of the Central Intelligence Agency (D/CIA).