A sportsbook is a gambling establishment that accepts bets on various sporting events. Sportsbooks are legal in some states, but bettors should always check with their local laws to ensure they’re playing within the law.

Understanding how a sportsbook sets betting lines can make you a savvier bettor and help you recognize potentially mispriced lines. For example, a sportsbook might lower the odds on an over/under total if they’re getting lopsided action on the under side. In this case, they’re trying to balance the action and reduce their exposure to potential liabilities. Also, as new information becomes available (such as injuries or weather), a sportsbook may adjust its lines.

In addition to moving handicaps in against-the-spread bets, sportsbooks also move odds in moneyline bets and totals in over/under and prop bets. In the latter case, they might lower a total if they’re getting a lot of action on the under side, and raise it if they’re getting a lot on the over. This is known as buying points, and it’s one way that sportsbooks try to level the playing field for their bettors.