In the executive branch the President's Cabinet is made up of the principal appointed officers of the executive branch of the federal U.S. government.
The Cabinet always includes the Vice President and the heads of the 15 executive departments : Agriculture, Commerce, Defense, Education, Energy, Health and Human Services, Homeland Security, Housing and Urban Development, Interior, Justice, Labor, State, Transportation, Treasury and Veterans Affairs.
There are also other officials with Cabinet-rank, some of them are: The White House Chief of Staff, The United States Ambassador to the United Nations or The U S. Trade Representative.
Cabinet officers are nominated by the President and confirmed by the Senate by a majority vote. The President may also select and appoint his own candidates for the Cabinet, people from all walks of life ( with the exception of Congress's members).