A casino or gambling house is an establishment where people can gamble money on various possible random outcomes, or combinations of outcomes. Some casinos are owned and operated by large corporations; others are independent. Most casinos offer a wide range of gambling games, such as blackjack, roulette, and slot machines. Some casinos also have restaurants and bars. In some jurisdictions, casinos are required to be licensed.

A modern casino is a high-tech facility that uses a variety of computer systems to monitor and control the activities of players and other staff members. These computer systems can be used for security, customer service, and a variety of other purposes. Many modern casinos are wired to a central system that allows supervisors to oversee the exact amount of money being wagered minute-by-minute, and alert them quickly to any statistical deviation from expected results.

The most prestigious and exclusive casinos offer a complete luxury experience, combining high stakes gambling with opulent suites and spas. The best casinos are often romanticized in film and literature with images of the high-stakes gaming tables surrounded by wealthy patrons in tuxedos and evening gowns.

The casino business is a huge industry worldwide, and is regulated in most countries. Most of the largest casinos are located in the United States, with about 2,000 casinos and 6,147 hotels that offer gambling. These casinos generate about $261 billion annually and employ more than 1.8 million workers. In addition, they contribute significantly to the tourism industry in their host cities and regions.