A casino is a gambling establishment that offers a variety of games of chance for patrons to wager on. While the term has become synonymous with a Las Vegas-style establishment, casinos exist in many forms. Some are more luxurious than others, but all casinos offer a wide selection of gambling activities.

In the United States, there are approximately 40 states with legalized casino gambling. The largest concentration of casinos is in Nevada, followed by New Jersey and Chicago. Some American Indian reservations also operate casinos.

A basic casino features a large area for gaming, with tables or slot machines arranged around the perimeter. Some casinos add restaurants, theaters and dramatic scenery to attract visitors.

Gambling is a risky endeavor, and patrons may be tempted to cheat or steal from each other or the casino staff. This is why casinos place a great emphasis on security measures. In addition to security cameras, a casino will likely have employees stationed throughout the building to monitor gamblers and their actions. This way, if someone is trying to manipulate the game, the casino will have witnesses that can provide evidence.