Gambling is an entertainment activity that combines skill and chance. Its precise origin is unknown, but gambling in some form seems to predate recorded history. Primitive protodice and carved six-sided dice have been found at many archaeological sites. The casino as a place where people can find a variety of ways to gamble under one roof did not develop until the 16th century, when a gambling craze swept Europe and Italian aristocrats held private parties in establishments called ridotti.

Modern casinos employ a number of techniques to attract customers. They are often located near or combined with hotels, resorts, restaurants, retail shopping, and cruise ships. They are also known for their live entertainment, such as stand-up comedy, concerts, and sports events. In addition, they offer a wide range of casino games, such as blackjack, roulette, craps, poker, and slots.

In the United States, legalized gambling is available in 40 states. Nevada is best known for its casinos, but New Jersey and Atlantic City have also become major destinations for casino visitors. Casinos are also popular in Canada, where there is a growing market for online gambling.

There is one certainty in gambling: the house always wins. The mathematical advantage built into the rules of each game is known as the house edge. The house edge ensures that the casino will make a profit, even if every player plays perfect strategy. While some players may win large sums, most will lose money. For this reason, it is important to understand the house edge before playing any casino game.