A "Bludger" is a type of ball used in the fictional sport of Quidditch, popularized by the Harry Potter series created by J.K. Rowling. In the game, there are two Bludgers that fly around the pitch, trying to knock players off their brooms. The objective of the Bludgers is to create chaos and disrupt the game. To counter the Bludgers, each team has two Beaters who use bats to hit the Bludgers away from their teammates and towards the opposing players. This adds an element of strategy and teamwork, as players must work together to avoid being knocked off their brooms while trying to score goals with the Quaffle.