A casino is a place where people gamble using games of chance or skill. Casino gambling may take place in massive resorts like those in Las Vegas or in smaller card rooms that are often part of bars, restaurants, and even truck stops. Casinos earn billions each year for the owners, investors, and Native American tribes that operate them. Successful casinos also pay millions in taxes to state and local governments.

While a casino is primarily a place for gambling, many also offer restaurants and stage shows. The first modern casino opened in the second half of the 19th century in Monte-Carlo, and the term was soon adopted for other places that housed similar games. Today, there are more than 3,500 casinos worldwide.

Gambling patrons must beware of cheaters and scam artists. Casino security is tighter than ever and uses sophisticated cameras, a high-tech eye-in-the-sky system, and trained personnel to spot suspicious behavior. Casinos are also a magnet for criminals because of the large amounts of money involved.

Casinos are designed to appeal to all of the senses, with flashing lights and clanging bells to attract attention. Some are built around a theme, such as a pirate ship or a sports arena. They are also arranged in a maze-like fashion so that wandering patrons encounter more and more gambling options. Big bettors are rewarded with free spectacular entertainment, luxury hotel suites, and limo service. Others receive comps, such as free meals and tickets to shows.