A casino, also known as a gambling house or a gaming establishment, is a place where people can gamble and win money. Most casinos offer table games such as blackjack, poker, craps, and roulette, as well as electronic gaming machines such as video poker. Some casinos also feature sports betting and other forms of entertainment. The United States leads the world with the most casinos, followed by Romania and Spain. Casinos are often designed with elaborate facades and interiors to create an atmosphere of opulence and excitement. They can be found in cities throughout the world and attract millions of visitors annually. Due to the large amounts of money involved, casino patrons and staff may be tempted to cheat or steal. This is why security measures are in place at most casinos.

Casinos are usually built near or combined with hotels, resorts, restaurants, retail shops, and other tourist attractions. In some countries, casinos are licensed and regulated by government authorities. They may be staffed by professional casino dealers or be self-serve. In some cases, casinos may also host live entertainment events such as concerts or stand-up comedy.

In the United States, casino gambling is legal in 40 states and the District of Columbia. Many casinos are located in popular vacation destinations such as Las Vegas, Atlantic City, and Chicago, or in metropolitan areas that are primarily populated by tourists. Other casinos are situated in remote locations such as the mountaintops of Virginia and West Virginia, or on cruise ships sailing the Caribbean.