The executive branch
Cabinet
The President's senior advisory body: the Vice President and the heads of the 15 executive departments, plus officials the President elevates to cabinet rank.
In full
The Constitution never uses the word; it only lets the President demand written opinions from 'the principal Officer in each of the executive Departments.' By custom the Cabinet comprises the VP and the 15 department secretaries, all Senate-confirmed, in the order of the presidential line of succession, with others (Chief of Staff, UN Ambassador, and similar) granted cabinet rank at the President's pleasure.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.