The Bookie is an area of the Casino. At the bookie, you can bet money on games from various sporting events.
The bookie works with a system of odds that gives higher rewards for betting correctly on a competitor that was not favored to win. Basically, the team or competitor that is likely to win has better odds, and will pay less for correctly betting. The team or competitor that is least likely to win has the worst odds, but will pay much more for betting on it and winning.