Final answer:
The President of the Senate, also the Vice President of the United States, votes only to break a tie in Senate. This power is essential for passing legislation or motions, and nominations that are evenly split.
Step-by-step explanation:
The President of the Senate, who is also the Vice President of the United States, typically does not vote on measures being considered by the Senate. However, they are granted the ability to cast a vote in the event of a tie. When the Senate is evenly split on a vote—whether it is about legislation, a motion, or a nomination—the tiebreaker vote can be provided by the Vice President. If the Senate is divided 50-50, the President of the Senate can vote to break the stalemate. The Vice President's role becomes crucial in such situations because without their vote, the matter at hand cannot move forward as the status quo would prevail.