A casino is a facility where people can gamble by playing games of chance or skill. Some casinos specialize in certain games, such as poker or blackjack, and some offer a wide variety of other gambling activities. Most casinos have security measures in place to prevent cheating or stealing by patrons, either in collusion with other players or by staff members.

In the United States, there are over 1,000 casinos, with the largest concentration in Las Vegas, Nevada. Casinos also operate in Atlantic City, New Jersey and Chicago. In addition, many American Indian reservations have casinos. Some state laws prohibit casino gambling, while others regulate it.

There are three general categories of casino games: gaming machines, table games, and random number games. Gaming machines, such as slot machines and pachinko, are played by one player at a time and do not require the involvement of casino employees. Table games, such as roulette, blackjack, and craps, involve a face-to-face interaction between players and the house, and are conducted by live dealers. Random number games, such as keno and bingo, use randomly generated numbers.

Some casinos offer traditional Far Eastern games, such as sic bo (which was introduced to European and American casinos in the 1990s), fan-tan, and pai gow. Occasionally, they offer other games of local interest, such as two-up in Australia or bangu bakau in Indonesia. Many casinos feature entertainment, such as shows or tournaments. Some have restaurants, bars, and hotels.