A casino is a gambling establishment that offers games of chance. These include card games such as blackjack and poker, as well as slot machines and other mechanical devices such as roulette and baccarat. The facility may also offer entertainment, dining, and shopping options. Some casinos are located near tourist attractions or combined with hotels, resorts, or cruise ships. Others are standalone facilities. Some casino games require skill, such as poker, but most are based on pure chance.

A small percentage of the money wagered in a casino game is retained by the house, and the remainder is paid out to winners. Casinos are regulated by government authorities to ensure fair play and prevent cheating. They are usually staffed with security guards and surveillance cameras to deter crime. Some casinos are operated by a private corporation, while others are owned and run by state or local governments.

Gambling in a casino involves social interaction, and patrons often shout encouragement to fellow gamblers or clap when winning. Many games are designed around noise, light, and excitement, and alcohol is served to players as part of the ambiance. Casinos also employ mathematicians specializing in gaming analysis to determine optimal plays in various games and calculate expected win amounts for gamblers. Casinos must always have enough money in reserve to cover losses, and to meet regulatory requirements. Therefore, it is very rare for a casino to make a net loss over the long term.