In the executive branch the President's Cabinet is made up <em>of the principal appointed officers of the executive branch of the federal U.S. government.</em>
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).