A sportsbook is a place where people can wager on sporting events. It accepts losing bets and pays winning bettors. It also earns revenue by charging a fee to place bets. This money helps pay for overhead expenses.

The top online sportsbooks are highly regulated and have many features that can help punters win. They feature a wide variety of betting markets and allow customers to use their mobile devices or desktop computers to make bets. In addition, they offer free bets and odds boosts. This can help players increase their bankroll and maximize their profits.

In 2018, DraftKings became the first operator to launch a legal sportsbook in the US after the Supreme Court struck down PASPA. It uses SBTech software and operates in several states. The site offers a variety of betting markets, a healthy welcome bonus and an online casino in certain states. It is also one of the best sportsbooks for over/under bets.

Despite the fact that online betting is regulated, some sportsbooks are more trustworthy than others. For example, BetMGM has a strong reputation due to its size and ownership structure. Its parent company is a publicly traded S&P 500 component and it is the largest online gambling company in the world. FanDuel, on the other hand, is a household name thanks to its DFS success and has a trusted brand. Its logo appeared on the Jumbotron above Bridgestone Arena as lineups were announced and on crews’ yellow jackets during timeouts as they rushed to shovel ice shavings from the rink.