A casino is a special establishment that offers gambling entertainment and opportunities to win real money. It is a popular form of recreational and leisure activity around the world.

While many people think of a casino as a place where luck determines winners and losers, the reality is that it has a carefully calculated business model that ensures its profitability. The mathematical odds of most games give the house a net profit, or expected value, and that is called the “house edge.” In the case of poker where players play against each other, the casino makes its profit by taking a cut of each pot or charging an hourly fee.

As disposable income increases throughout the world and tourism becomes a global industry, casinos are expanding to accommodate an international audience. They are also investing heavily in technological improvements to improve security and monitor patron activities. Chip tracking systems allow casinos to observe betting patterns minute by minute; roulette wheels are electronically monitored for any statistical deviations from their expected values; and video cameras are routinely employed to catch cheating or other criminal behavior.

The earliest casinos were run by organized crime figures, who invested their money in gambling operations to make large profits and avoid criminal prosecution for other illegal rackets such as drug dealing and extortion. As legal gambling expanded and Nevada became a destination for tourists, legitimate businessmen with deep pockets saw the potential of this business and began buying out the mobsters. Today, casinos are owned by hotel and resort chains, investment firms, and individuals such as Donald Trump.