Casino is a gambling establishment where people can wager cash or other items of value on various types of chance-based games. Casinos are often located in or near large cities and are often themed to reflect their local culture. In the United States, there are over 1,000 casinos, with the largest concentration being in Las Vegas, followed by Atlantic City and Chicago. Casinos also operate online, where they can be accessed from a computer or mobile device. The casino industry is regulated in most jurisdictions by laws designed to prevent cheating and theft, both between patrons and employees. Casinos employ security measures such as closed circuit television and random number generators to ensure fair play. In addition, the house edge and variance of casino games are mathematically calculated by mathematicians and computer programmers who specialize in the field of gaming analysis.

In modern times, casinos have come to be associated with luxurious amenities and a plethora of dining and entertainment choices. As a result, they compete to offer the best overall experience, often in spectacular settings. The biggest casinos in the world feature ultra-modern, palatial facilities that rival resorts for their size and scale. They offer a wide range of food and beverage options, from Michelin-starred restaurants to dazzling entertainment shows featuring top musicians.

Some casinos offer sports betting and horse racing, while others focus on specific regional interests. The Winstar World Casino in Oklahoma, for example, is famous for its off-track horse racing and offers online betting as well.