A casino, also known as a gambling house, is an establishment for certain types of gambling. Casinos are most often found in resorts and cities such as Las Vegas and Atlantic City, and are often combined with hotels, restaurants, retail shopping, convention facilities and other entertainment options. In the United States, there are more than a thousand commercial casinos and nearly half a dozen tribal casinos.

Slot machines are the main attraction in most casinos. They are easy to use and provide an instant source of revenue with little or no player skill required. They are based on a random number generator (RNG) and display various patterns of colored shapes on reels (actual physical ones or video representations). The player pushes a button or pulls a handle to spin the reels and, if the right combination appears, the machine pays out a predetermined amount of money.

Many casinos have a variety of table games to offer players, such as blackjack, roulette, craps, and baccarat. Some casinos also feature poker tables, especially in the United States where a large portion of the population is interested in this game and where some of the biggest events are held, including the World Series of Poker.

Given the large amounts of money that are handled within a casino, both patrons and employees may be tempted to cheat or steal. For this reason, most casinos have security measures to prevent this from happening. These include security cameras located throughout the property and trained personnel to spot potential problems.