A casino is a place where people can play gambling games. These games include casino-type machines, table games such as blackjack and craps, and random number-based games such as roulette or baccarat. In the United States, federal law requires casinos to withhold income taxes from certain winnings. In addition, some states have specific laws regulating the taxation of casino profits.

In the 21st century, the casino industry has grown to be a major international business. Many large casino resorts are located in cities such as Las Vegas, Nevada; Monaco; Macau, China; and Singapore. Many countries have legalized casinos. The growth of the internet and increasing globalization have also contributed to the expansion of casinos.

Casinos are generally open to anyone who is of legal age to gamble. The legal age varies by state and gambling product, with most casinos requiring a minimum of 21 years old to play table games or slot machines. However, some states permit players to gamble at a casino at the age of 18.

Casinos have various security measures in place to prevent cheating and stealing. These include security cameras, employee screening, and a variety of other methods. In addition, some casinos have catwalks in the ceiling that allow surveillance personnel to look down on the gaming floor through one-way glass. Staff may be tempted to steal, either in collusion with patrons or on their own, due to the large amounts of money handled in the casinos.