The executive branch
executive agreement
An international commitment a President makes without a Senate treaty vote. Most U.S. agreements abroad take this form, and a later President can undo one.
In full
Treaties need two-thirds of the Senate; executive agreements need only the President, sometimes backed by an existing statute or by a promise to seek funding. The great majority of U.S. international commitments are executive agreements. Their weakness is their flexibility: because no Senate vote locks them in, they can be exited as easily as they were entered.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.