A casino is an establishment for certain types of gambling. Casinos are often built near or combined with hotels, resorts, restaurants, retail shops, and other tourist attractions. They are also known for hosting live entertainment such as stand-up comedy, concerts, and sports events. In some countries, casinos are licensed and regulated by gaming boards or other government authorities. Casino may also refer to:

Gambling in a casino is generally considered safe, although some states have banned or restricted casino activities, and the use of some devices such as slot machines can lead to addiction. In addition, some studies have indicated that gambling has a negative impact on local economies. Addiction to gambling can cause a shift in spending away from other forms of entertainment, and the cost of treatment of problem gamblers offsets any economic gains a casino brings to its community.

In the United States, there are over 1,000 casinos. Many of these are located in Las Vegas, Nevada; other cities that attract casino tourists include Atlantic City, New Jersey and Chicago, Illinois. Some casinos are small and locally owned, while others are large and internationally operated. Many casinos offer free admission for local residents, but some require a guest list or a reservation.

Most casino games are based on chance, although some involve an element of skill. Some have fixed odds, allowing the house to always gain an expected value of zero or less, while other games have variable odds that depend on player bets and other variables. The advantage of the house is often referred to as the house edge. Casinos often compensate for this advantage by offering complimentary items to players, known as comps.

Some casinos have large gambling floors with a variety of games and seating for thousands of patrons. They are often decorated in bright and sometimes gaudy colors, to stimulate the senses and increase the excitement of the gambling experience. Red is a common color used in casino decor, as it is thought to make people lose track of time. Many casinos have no clocks on the walls, as it is believed that seeing a clock would distract people from the gambling action.

A casino’s security staff is trained to spot cheating or other suspicious activity by observing regular routines and patterns. For example, the speed at which a dealer deals cards and the location of betting spots on the table follow a set pattern, and security personnel can quickly spot any deviations from these patterns. In addition, some casinos use a system of hidden cameras to monitor the casino floor and its patrons. These cameras are linked to a central monitoring station, where staff can instantly view any video footage. This is especially useful when a guest attempts to defraud the casino by committing fraud such as stealing chips from another player. The most prestigious and well-known casinos are found in Las Vegas, Nevada, but there are a number of notable ones elsewhere in the world.