A casino is a facility for certain types of gambling. The modern casino is a multi-use building that features games of chance and skill, as well as restaurants, bars, and entertainment. It is also a popular destination for conventions and business meetings.

Gambling in casinos is regulated by state and local laws. The laws vary by jurisdiction and type of game, and may prohibit some forms of gambling or require a minimum age to play. In the United States, casino gambling is primarily legal in Atlantic City, New Jersey, Las Vegas, Nevada, and on Native American reservations, where casinos are operated by American Indian tribes.

Most casinos offer a wide variety of games, including roulette, baccarat, blackjack, and slot machines. Some of these games involve skill, while others are purely random. In most cases, the house has a mathematical advantage over players, which can be expressed as an expected value that is uniformly negative (i.e., less than zero). The exact odds of a given game are calculated by mathematicians who specialize in gaming analysis.

Because of the large amount of money involved, security is a major concern for casino patrons and staff alike. Modern casinos usually employ a combination of physical security forces and specialized surveillance departments that monitor the floor via closed circuit television. In addition, most casinos have self-exclusion programs and hotlines for problem gamblers. These resources are especially important for those who have a gambling addiction.