The executive branch
enrolled bill presentment
The formal delivery of a passed bill to the President, which starts the ten-day constitutional clock for signature, veto, or becoming law unsigned.
In full
Article I, Section 7 requires every bill to be presented to the President. From presentment the President has ten days, Sundays excepted, to sign or return it. Doing nothing lets it become law, unless Congress has adjourned in the interval and thereby prevents its return, which is the pocket veto. Congress controls the timing of presentment, and has sometimes used that timing deliberately.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.