A casino is a gambling establishment that offers various types of gaming. A casino also may offer other services such as a hotel, restaurant, or entertainment facilities. The United States is home to the largest number of casinos, followed by Europe and then Asia. Many states have legalized casinos, including some that are open to interstate traffic. Most of these casinos are located in cities with a high concentration of tourist activity, such as Las Vegas and Atlantic City.

In the United States, most of the games that are available in casinos are table games. These include poker, blackjack, and roulette. Other popular games are video slots and craps. Some table games are played against the house, while others are conducted by a live dealer. Casinos use electronic monitoring systems to oversee the games, and to discover any anomalies quickly.

Because casino gambling involves large amounts of money, casinos must be careful to prevent cheating and theft by both patrons and staff. To prevent these risks, casinos generally employ security measures such as video surveillance and armored car services. In addition, many casinos have catwalks that allow supervisors to look down on the games from above, through one-way glass.

To encourage gamblers to spend more than they intend, casinos often provide perks and benefits. These may include discounted travel packages, free meals, and other incentives. These rewards are known as comps. Some casinos specialize in high-stakes gambling and maintain special rooms away from the main floor where the stakes can be tens of thousands of dollars.