The Filibuster Rule is a procedural tactic in the U.S. Senate that allows a minority of senators to extend debate on a piece of legislation, effectively delaying or blocking a vote. This practice requires a supermajority of 60 votes to invoke cloture and end the debate, which gives the minority party significant leverage in legislative processes. The filibuster highlights the dynamics of power and negotiation within the Senate, as it often forces compromise and deliberation on contentious issues.