A Casino is an establishment for certain types of gambling. Casinos are often combined with hotels, restaurants, retail shopping, convention centers, and other entertainment venues. They are the largest source of revenue for some cities and states. They provide a form of entertainment for millions of people and are an important source of revenue for the tourism industry. They also serve as a gathering place for various social, political, and business activities. In some countries, casinos are legal, while in others they are not.

The modern casino is like an indoor amusement park for adults, with the vast majority of entertainment (and profits for the owners) coming from gambling. The most popular games are slot machines, blackjack, roulette and craps.

In games that require skill, the house has a mathematical advantage, which can be minimized by following basic strategy. The house edge varies by game, rules and number of decks used. In games where patrons play against each other, the casino earns money through a commission known as the rake.

Most casinos have security measures in place to keep their patrons safe. Besides cameras, they have specialized staff who monitor table games and players for any suspicious activity. For example, betting chips have built-in microcircuitry that interacts with electronic systems to allow the casino to track the exact amounts placed minute-by-minute and quickly discover any statistical deviation from expected results. Many casinos also employ pit bosses and table managers with a wider view of the games, checking to see that players are not cheating by palming or marking cards or dice.