Bludgers are enchanted balls used in the sport of Quidditch, a popular game in the Harry Potter series. They are designed to fly around the pitch and try to knock players off their brooms. There are two Bludgers in each game, and they are controlled by the Beaters, who use bats to redirect them away from their teammates. The primary purpose of Bludgers is to create chaos and challenge the players. They add an element of danger to the game, as players must constantly be aware of their movements. Successfully avoiding or managing Bludgers is crucial for a team's success in Quidditch.