Filibustering is a political tactic used in the United States Senate to delay or block legislation. It involves a senator speaking for an extended period, often on unrelated topics, to prevent a vote on a bill. This practice can require a supermajority to end, making it a powerful tool for the minority party. To end a filibuster, the Senate can invoke cloture, which requires a minimum of 60 votes. Filibustering is often seen as a way to protect minority interests, but it can also lead to gridlock, where important legislation is stalled due to prolonged debate.