A filibuster is a political strategy used in the U.S. Senate to delay or block legislative action. It allows a senator or a group of senators to extend debate on a proposed bill, effectively preventing a vote. This tactic can be employed by speaking for an extended period or by using procedural maneuvers, making it a powerful tool for the minority party to influence legislation. The term originates from the Spanish word 'filibustero,' meaning pirate, reflecting the disruptive nature of this tactic. While it can protect minority interests, it has also led to debates about its impact on legislative efficiency and the need for reform in the Senate rules.