The Vice President of the United States is the Speaker of the Senate.
This role is outlined in the U.S. Constitution, specifically Article I, Section 3, Clause 4, which states: "The Vice President of the United States shall be President of the Senate, but shall have no Vote, unless they be equally divided."
The Vice President presides over the Senate, but they only vote in the case of a tie. The Vice President's role in the Senate is primarily ceremonial and involves presiding over the Senate sessions and casting the tie-breaking vote when necessary.
The Senate also has a President Pro Tempore, who serves as the presiding officer when the Vice President is absent. The President Pro Tempore is typically the longest-serving member of the majority party in the Senate. This position is largely ceremonial and does not carry the same power as the Vice President.