A casino is a facility for gambling. It offers customers a variety of games of chance, in some cases with an element of skill, and is operated by a professional operator. A casino may also offer food and drinks. Its revenues derive mostly from gamblers. Its staff is often tipped heavily.

Most casinos use statistical methods to ensure that they can win more than a reasonable percentage of the bets placed by patrons. This advantage, known as the house edge or vigorish, can be very small, but over time it can earn casinos billions of dollars in gross profit, allowing them to afford spectacular hotels and extravagant decorations such as fountains, giant pyramids, towers, and replicas of famous landmarks. Casinos also generate revenue from slot machines and (since the 1980s) video poker machines, which are designed to take a high percentage of wagers in high volume and rapid play at sums ranging from five cents to a dollar.

Critics argue that the casino industry’s profits are often illusory, and that the social costs of compulsive gambling undermine any economic benefits they might bring to communities. They also note that the cost of treating problem gamblers and lost productivity from their addiction can offset any casino’s positive economic impact. Security is an enormous concern, and casinos employ numerous measures to prevent cheating, stealing, and other crimes. These include a physical security force and a specialized department for monitoring closed circuit television.