A filibuster is a political procedure where one or more members of parliament or congress debate over a proposed piece of legislation so as to delay or entirely prevent a decision being made on the proposal.
The most common form occurs when one or more senators attempt to delay or block a vote on a bill by extending debate on the measure. The Senate rules permit a senator, or a series of senators, to speak for as long as they wish, and on any topic they choose, unless "three-fifths of the Senators duly chosen and sworn" (currently 60 out of 100) vote to bring the debate to a close by invoking cloture under Senate Rule XXII.
January 2022 the Senate blocked a Democrat attempt to remove the filibuster which was blocking the John Lewis Voting Rights Advancement Act. The Senate voted 50-49 to pass the bill, falling well short of the 60 votes needed to break the filibuster.