A filibuster can be in place by a party, it's when a group of Senators take turns speaking. They can pass it on to other Senators, which no one can object do, and each Senator does not have a limited amount of time. They can even read from a phone book if they want to. While a Senator is talking, no one can interrupt the Senator. A vote can stop the filibuster and force a vote, called the cloture.
