A casino is a facility for certain types of gambling. Modern casinos usually include a large number of game tables and slot machines. Some also offer live entertainment, such as stage shows and concerts. Casinos are operated by governments, Native American tribes, or private businesses. They may be located in cities, resorts, or private islands. The casino industry contributes billions of dollars to the United States economy each year.

The games offered by a casino have mathematically determined odds that ensure the house has a long-term advantage over the players. The edge is known as the house edge or vigorish. Casinos make their money by charging a percentage of the bets made by players, called a vig or rake. Casino games may also require skill, and players who possess sufficient skills to eliminate the house edge are known as advantage players.

Unlike most other forms of gambling, casino games are regulated by state and federal laws. The legal age to gamble in the US varies by state and by gambling product, but is generally 21 years of age. The majority of state-licensed and regulated casinos are found in Nevada, followed by New Jersey and New York. Most US states prohibit the use of credit cards to fund a casino account, though some allow deposits with debit cards. In addition, many US banks have special programs to assist casino patrons with depositing and withdrawing funds. The vig is the most common source of revenue for a casino, but other sources of income include keno and horse racing.