A casino (also known as a gaming house or a gambling establishment) is an establishment for certain types of gambling activities. Modern casinos often feature multiple gaming tables, slot machines, video poker, table games, and a variety of other gambling-related entertainment options. Some casinos also include bars, restaurants, and retail shops. Casinos are usually located in areas surrounded by tourist attractions or other high-traffic areas. Casinos are regulated by state law and operate under strict security measures. Security is typically divided between a physical security force and a specialized surveillance department that operates the casino’s closed-circuit television system.

The exact origin of gambling is unknown, but it is widely believed that gambling in some form has been present in nearly every culture throughout history. Some of the earliest documented examples of gambling are found in ancient Mesopotamia, China, and India. More recently, modern casinos have become popular in many parts of the world and are a major source of revenue for some states.

The United States has the highest number of casinos in the world, with most located in Nevada and Atlantic City, New Jersey. Other states, such as Chicago and Texas, have a smaller number of casinos but still generate significant amounts of gambling revenue. In the past, casinos were more prevalent in Europe, particularly in the United Kingdom, where they were called “gambling houses” and were frequented by spies, dispossessed royals, and wartime adventurers. The popularity of these casinos grew into the 21st century with the advent of online gaming and massive bonuses.