A casino (also known as a gambling house or a gaming establishment) is an establishment for playing various games of chance for money. Casinos are often combined with hotels, restaurants, retail shopping, and other entertainment facilities. Some casinos host live entertainment, such as stand-up comedy or concerts. In some countries, casinos are regulated by law. Some are owned by public corporations, while others are owned and operated by private individuals or groups. In the United States, casinos are mostly located in Nevada and are usually licensed and regulated by state governments.

The precise origin of gambling is unknown, but it appears in almost every culture around the world. Modern casinos are designed to entice gamblers by offering food, drink and entertainment. The casino industry is a major source of revenue for some nations. It is estimated that the casino industry generates more than a trillion dollars worldwide annually.

Although casino gambling is largely a game of chance, there is a certain amount of skill involved. Some games, such as craps and roulette, have mathematically determined odds that give the house an advantage over players. Other games, such as blackjack and baccarat, involve players against each other, but the casino makes its profit by taking a percentage of the money bet.

The most famous casinos in the world are based in Las Vegas, although many others exist. Some are lavish, over-the-top temples of overindulgence, while others are more restrained in their approach. Casinos are generally open to all ages, but they are also targeted at specific types of people. For example, high rollers are offered special rooms and services because their gambling spend can be in the tens of thousands of dollars.