A casino, also known as a gambling house or a kasino (from Latin, meaning “house”) is an establishment for certain types of gambling. Casinos are often combined with hotels, restaurants, retail shops, and other tourist attractions. In some countries, casinos are legalized and regulated. Other countries ban or restrict them. Casinos are most famous for offering gambling games such as poker, blackjack, roulette, and slot machines. Some of them are also well known for hosting international championships of poker.

While elaborate hotels, lighted fountains, shopping centers, and other amenities may lure visitors in, casinos would not exist without games of chance like slot machines, poker, craps, baccarat, and blackjack, which provide the billions of dollars in profits casinos rake in every year. These games are based on random chance and require no skill or strategy whatsoever. A player simply inserts a coin or paper ticket with a barcode into a machine and then pulls a lever or pushes a button. The machine then spins reels with varying patterns of colored shapes and, if the right pattern appears, the player wins a predetermined amount of money.

While something about gambling (perhaps the presence of large amounts of money) seems to encourage people to cheat and steal, whether in collusion or independently, casinos spend a lot of time and money on security. Most modern casinos have a dedicated physical security force and a specialized surveillance department that works closely together to prevent crime.