A sportsbook is a venue – a website or brick-and-mortar building – where people can place bets on different sports. They can also be called bookmakers or bettor’s shops, but the term ‘sportsbook’ usually refers to a facility that is licensed and regulated by state laws. They must meet certain regulatory standards that include responsible gambling and data privacy.

While the legality of sports betting varies by state, most have passed laws to allow it. It was illegal in the United States until 1992, when the Professional and Amateur Sports Protection Act (PASPA) was passed. After that, Nevada, Oregon, and Montana began legalizing sportsbooks. A Supreme Court ruling in 2018 allowed other states to follow suit.

Sportsbooks make money by charging a small commission on losing bets, known as the vig or juice. This is often a standard 10% but can be much lower or higher. They also adjust lines to avoid lopsided action and reduce their liabilities. This can be done by moving a line or offering a reduced house edge, such as in the case of point spreads. They can also move a line to respond to news, such as an injured player or coach.

While there are no surefire ways to win at sportsbooks, punters can improve their chances by keeping track of their bets and following news on players and coaches. They should also be mindful of their bankroll and only bet money they can afford to lose.