A casino, also known as a gambling hall, is a room where people can play games of chance. Most casinos feature a variety of slot machines and table games, such as poker, blackjack, craps and roulette. A few casinos offer video slots and even keno. In addition to gambling, many casinos have shows and other entertainment attractions. The most famous casino is probably the Bellagio in Las Vegas, but there are many others around the world.
Gambling almost certainly predates recorded history, with primitive protodice and carved six-sided dice appearing in archaeological sites. But the modern casino as a place for people to find a wide variety of ways to gamble under one roof did not develop until the 16th century, during a period when gambling crazes swept Europe. 
Most casino games are based on pure chance, although some have an element of skill. The house always has a mathematical advantage over the players, which can be expressed as the house edge. Casinos make their profit by taking a percentage of the bets made by patrons, or by charging an hourly fee for games such as baccarat. Some casinos give away free items, such as food, drinks or hotel rooms, to frequent visitors; these are called comps.
Something about gambling seems to encourage people to cheat and steal, but casinos spend a lot of time and money on security. For example, the way dealers shuffle and deal cards and the expected reactions of players follow predictable patterns, making it easier for security personnel to spot suspicious activity.