The executive branch
Cabinet secretary
The head of an executive department, nominated by the President and confirmed by the Senate. The Attorney General heads Justice under a different title.
In full
Secretaries run departments of tens or hundreds of thousands of employees, testify to Congress, sign major regulations, and sit in the Cabinet. They serve at the President's pleasure and can be removed at any time. The order in which their departments were created sets their place in the presidential line of succession, beginning with State.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.