A Casino (or gambling house) is an establishment for certain types of gambling. Modern casinos are often combined with hotels, restaurants, retail shops, and other entertainment facilities. In the United States, casinos are licensed and regulated by state governments. Most casino games involve chance, but some allow skill and strategy. Most casino games have a mathematical advantage for the house, which is determined by the rules and pay tables of each game. This advantage is the primary source of revenue for the casino.

Gambling has been a popular pastime for many people throughout history and is associated with both glamour and seediness. Today, casinos are a multibillion-dollar industry that offers thrills and excitement to millions of people around the world. Despite the glitz and glamor, most of the profits that casinos generate are from games of chance like slots, blackjack, roulette, poker and craps.

In the twenty-first century, most casinos focus their investments on the high rollers. These are the gamblers who bet tens of thousands of dollars and often play in special rooms that are isolated from the main floor. To attract these bettors, most casinos offer comps such as free hotel rooms, meals and tickets to shows.

Although many people associate Casinos with gangsters and organized crime, the mob is no longer in control of Casinos. As real estate investors and hotel chains gained more money, they began to buy out the mobsters and run their own casinos without mob interference.