A casino is a facility for certain types of gambling. In the United States, casinos are licensed and regulated by state governments. The most famous casinos are located in Las Vegas and Atlantic City, although there are more than 1,000 casinos in total across the country. Some of these casinos are owned by tribes, and others are commercial or public enterprises. Casinos often feature a variety of games, including roulette, blackjack, and video poker. Some also offer sports betting and horse racing.

A casino may offer free food or drinks to players, and some even have live entertainment. Some casinos have security measures, such as cameras, to prevent cheating or theft by patrons. They may also have support resources, such as a hotline or self-exclusion programs, for problem gamblers.

In some jurisdictions, casinos are legal only in specific areas or on Indian reservations. In other places, they may be prohibited by law or regulation. Some casinos are operated by state-licensed organizations, such as the Nevada Gaming Control Board or the Illinois Gaming Authority. Others are run by private corporations, such as the MGM Resorts International or the Wynn Corporation.

In general, casinos depend on luck for their profitability, but they can also use a mixture of skill and chance. Some casino games, such as baccarat and roulette, involve complex mathematics. Other casino games, such as slots and video poker, have a random number generator (RNG) that produces a series of numbers or symbols that correspond to various outcomes. Most of these games have a mathematical advantage for the house, and this advantage is called the house edge.