The casino (also known as the gaming house or gambling house) is an establishment for certain types of gambling. Casinos are often combined with hotels, restaurants, retail shops or other tourist attractions. In the United States, casinos are regulated by state and local laws. The American Gaming Association estimates that over 51 million people visited domestic and international casinos in 2002. Most of these casinos are located in the Las Vegas metropolitan area, although many cities around the world have casinos. During the 1980s, some American Indian reservations opened casinos, which are exempt from state antigambling laws.

There are three main categories of casino games: gaming machines, table games and random number games. Gaming machines, such as slots and video poker, allow players to gamble in a game of chance using cash or casino chips. They usually have built-in microcircuitry that monitors the amount of money deposited and paid out, and can detect any fraudulent activity. Table games, such as blackjack and roulette, require the involvement of casino employees called croupiers. Random number games, such as keno and bingo, use a random number generator to determine the outcome of a game.

The best online casinos feature a wide variety of casino games, including popular slot titles and progressive jackpots. They also offer a full range of deposit and withdrawal methods, and have fast load speeds. The best casino websites also have 24/7 customer support centers that are available via live chat or phone.