had operational legalized sports betting. As of January 2023, 30 states including Washington D.C. Even when the practice is legal, regulations regarding sports betting vary on a state-by-state basis. In the U.S., sports betting is legal at the federal level, however, it is still not legal in every state. In 2021, the total sports betting revenue in the United States amounted to 4.33 billion U.S. Sportsbooks operate both as land-based establishments, for example, at casinos or betting shops, and online. Bets are typically made through sportsbooks, also known as bookmakers, or bookies. Sports betting is a type of gambling that refers to the act of placing a wager on the outcome of a sporting event.