A casino is a facility where people can gamble through games of chance. It can also be called a gambling hall or a gaming room.

The idea of a casino as a place where people could find a variety of ways to gamble under one roof probably originated in the 16th century. At that time a gambling craze was in full swing, and wealthy Italian aristocrats often held parties at places called ridotti (a corruption of casino) where they could gamble and drink without the fear of being bothered by authorities.

Gambling has always been a popular entertainment for many people. During the early twentieth century, however, it was illegal in most states. This stifled the growth of casinos until 1931 when Nevada legalized gambling. Other states began to follow suit, and the casino industry exploded.

In the twenty-first century, casinos are focusing on customer service. Most offer loyalty programs similar to airline frequent-flyer programs. Patrons swipe their cards before each game session to record their activity and tally up points. These can be exchanged for free slot play, food, drinks, and show tickets. Casinos also use this information to track gambling trends and to develop their marketing strategies.

The typical casino gambler is a forty-six-year-old female from a high-income household. She is most likely to play slots or video poker, according to a study by Roper Reports GfK NOP and the U.S. Gaming Panel by TNS. She is also more likely to be a high roller who frequents special rooms on the casino floor and is given a lot of comps, or complimentary items, such as hotel rooms and show tickets.