A casino is a gambling establishment that offers games of chance and sometimes skill. The casino industry generates billions of dollars annually for its owners, corporations, investors and Native American tribes. Casinos also provide entertainment and employment for many people. The main sources of revenue for casinos are the money gamblers place on slot machines, tables and other gaming devices, and the rake taken by poker and other card games.

Because of the large amounts of cash handled within a casino, both patrons and staff may be tempted to cheat or steal, either in collusion with other patrons or on their own. To counter these risks, casinos spend a great deal of time, effort and money on security. This includes the use of cameras, security personnel and other securing measures.

In addition to these measures, casinos try to create an atmosphere that will attract and hold customers. This can include lighting, color schemes and a variety of other factors. For example, red is often used in casino decor because it is thought to stimulate the senses and make players more alert. Casinos also try to avoid distractions, such as clocks, in order to keep players focused on their gambling activities.

Lastly, casinos try to reward loyal patrons with comps (free items). These are often given to high rollers, who are gamblers who spend more than average. During the 1970s, Las Vegas casinos were famous for giving away free hotel rooms, buffet meals and tickets to shows to these high-volume gamblers. Today, many casinos offer clubs that are similar to airline frequent-flyer programs, where patrons are rewarded with perks based on how much they spend and how long they play.