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In page United States Congress:

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Voting within Congress can take many forms, including systems using lights and bells and electronic voting.[1] Both houses use voice voting to decide most matters in which members shout "aye" or "no" and the presiding officer announces the result. The Constitution requires a recorded vote if demanded by one-fifth of the members present or when voting to override a presidential veto. If the voice vote is unclear or if the matter is controversial, a recorded vote usually happens. The Senate uses roll-call voting, in which a clerk calls out the names of all the senators, each senator stating "aye" or "no" when their name is announced. In the Senate, the Vice President may cast the tie-breaking vote if present when the senators are equally divided.[citation needed]