A casino is a gambling establishment where people wager money on games of chance or, in some cases, skill. The games played in casinos include poker, blackjack, craps, roulette, and video poker. Most of these games have mathematically determined odds, which give the house an advantage over the players. This edge, which is known as the house edge, can vary between different types of gambling games.

In the United States, casinos are mostly located in Nevada and New Jersey. In the 1980s a number of American Indian reservations opened casinos, which are not subject to state antigambling laws. In Europe, licensed and regulated gambling clubs operate in London, and many other European countries have casinos. Casinos also exist on cruise ships and in other locations outside the United States.

Casinos try to attract customers by offering a variety of perks. These include free rooms, buffets, and shows. In addition, casinos use a variety of tricks to encourage patrons to gamble more. For example, they often decorate the gambling floor in bright colors that stimulate the senses and make people want to spend more money. Additionally, casino employees constantly entice patrons by displaying new betting options.

Casinos also focus on high-rollers, who are a major source of profits. They usually gamble in special rooms that are away from the main floor, and they receive lavish comps (complimentary items) worth thousands of dollars. However, economic studies have found that the overall impact of casinos on a community is negative, because they divert spending from other forms of entertainment and can lead to gambling addiction.