A casino is an establishment where people can play gambling games. These include roulette, baccarat, blackjack, and video poker. Most casinos also have restaurants and other entertainment venues. Some also offer sports betting and horse racing. In some countries, casinos are regulated by government agencies.

The precise origin of gambling is unknown, but it is believed to have existed in some form throughout history. Some of the earliest records of gambling come from ancient Mesopotamia and China. Modern-day casino gaming began in Nevada, and it took decades before other states legalized the industry.

Most casinos earn much of their revenue from high rollers. These are people who make large bets, often in the tens of thousands of dollars. Usually, these bets are placed in special rooms away from the main floor. They may also be offered free shows or other amenities, such as limo service and airline tickets. Casinos can give these players comps based on the amount of money they spend and how often they gamble.

There is something about the presence of large amounts of money that encourages people to cheat or steal, either in collusion with other patrons or independently. This is why casinos spend a lot of money on security measures. These include cameras that monitor all areas of the casino and security personnel who are ready to intervene in the event of a dispute. Some casinos also have catwalks that allow surveillance personnel to look down directly on the tables and slots through one-way glass.