Quaffle

After a goal is scored, the Keeper of the team scored upon throws the Quaffle back into play.

Chasers score by sending the red, football-sized Quaffle through any of the three goal hoops.

It is explained in Quidditch Through the Ages that the Quaffle is enchanted to fall very slowly through the air when dropped to prevent players from having to continuously dive to retrieve it.

Matches are played between two teams of seven players riding flying broomsticks, using four balls: a Quaffle, two Bludgers, and a Golden Snitch.

The backstory of Quidditch explains that the red colour was instituted to create a stronger contrast between the Quaffle and mud.

The Keeper has to protect the team's goal hoops by flying in front of them and stopping the opponents from throwing the Quaffle through them.

The Quaffle is also enchanted to make it easy to grip with only one hand.

The Quaffle is thrown into the air by the referee to signal the start of play.

They are not allowed to hit the Bludgers at the crowd, the referee, or the Keeper (unless the Quaffle is inside the scoring area).