In its simplest form, a sportsbook is an establishment that accepts bets on sporting events and pays those who correctly predict the outcome of a contest. In addition to offering a variety of betting options, sportsbooks also provide a level-headed menu of controls designed to keep gambling recreation from spiraling out of control.

Sportsbooks set odds that are intended to attract a balanced amount of wagers on both sides, with the goal of earning money regardless of the outcome. They manage their risk in cases where the flow of bets isn’t perfectly balanced by adjusting the odds or engaging in separate offsetting bets (laying bets).

Most sportsbooks offer over/under bets, which are based on the total number of points scored in a game. While they do not guarantee a winner, they are popular amongst betting enthusiasts and can be a great way to spice up a game.

In addition to over/under bets, most sportsbooks offer a variety of prop bets. These bets are made on specific aspects of a game, and can range from the mundane (e.g., how many turnovers will there be in a game) to the absurd (e.g., when will aliens invade Earth).

Some sportsbooks also allow bettors to place futures wagers. These bets are placed on future events and pay off when the event occurs. For example, a bettor can place a futures bet on the Super Bowl winner before the season starts. This type of bet is typically available year-round and the payouts are reduced as the season progresses.