A bookie's customer is known as a BETTOR. Bettors are individuals who place wagers on the outcome of a certain event, such as a sporting match or a horse race. They may also place bets on other forms of gambling, such as casino games or lotteries. Bettors can be found in both legal and illegal gambling establishments, depending on the laws of the jurisdiction. Bettors typically place their bets with a bookie, who is an individual or organization that takes bets and pays out winnings.