This refers to an advisory group selected by the President to aid in making decisions. The cabinet includes heads from each executive department along with other individuals chosen by the president.
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Executive Office of the President: The cluster of presidential staff agencies that help the president carry out his responsibilities.
Presidential Succession: The order in which officials fill the office of president in case of a vacancy.
White House Staff: Personnel who run the White House and advise the President. Includes Chief of Staff, Counselors to the President, Press Secretary etc.