Casino is a place where people gamble by playing games of chance. Many of these games are based on luck, while others involve skill. In most cases, the casino has a long-term advantage over players and pays out winning bettors a small fraction of their total investments, referred to as a house edge or vigorish. Some casinos also collect a commission from the players, called a rake. Those who possess the necessary skills to eliminate the house advantage are known as advantage players.

In the twentieth century, as disposable income increased throughout the world and travel became more accessible, casinos spread to every major city. As of the early twenty-first century, there were more than 1,000 casinos worldwide. Some casinos are owned by large corporations; others are owned by individual owners. Most casinos are located in cities with high populations of people who enjoy gambling.

Most casinos offer a wide range of casino games, including roulette, blackjack, poker, craps, and slot machines. Some of them also offer live entertainment and top-notch hotels, spas, and restaurants. Some casinos specialize in certain types of games, such as baccarat or sic bo.

The casino industry focuses on attracting high-stakes customers and making them spend more money than the average customer. To encourage them to gamble, the casinos often provide alcoholic drinks and snacks free of charge and create an environment designed around noise, light, and excitement. They also reward their most loyal customers with comps (free items) and other perks.