Sportsbooks operate by setting odds on the various outcomes of sporting events. They make their profit through the spread and by charging a commission, known as 'vig' or 'vigorish', on bets. Sportsbooks can be found in physical locations, such as casinos, or operate online, providing users the convenience of placing bets from anywhere. In jurisdictions where betting is regulated, sportsbooks must comply with various legal and regulatory requirements, including age verification and responsible gambling promotions.