Making laws
veto
The President's refusal to sign a measure, returning it to Congress with objections. Congress can override with two-thirds of both chambers.
In full
Within ten days (Sundays excepted) of receiving a passed measure, the President may sign it, let it become law unsigned, or veto it, returning it with a message of objections to the chamber where it began. A vetoed measure becomes law anyway if two-thirds of each chamber votes to override, a bar high enough that most vetoes stand.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.