A casino (pronounced kas-ino) is a place where people can gamble and play games of chance. It also has entertainment and dining facilities. Casinos are regulated by state and local laws. People can gamble at casinos if they are over the age of 21 and have the required identification. Some states require players to sign up for a self-exclusion list. Others prohibit certain types of gambling.

In the United States, most land-based casinos are operated by Indian tribes. Many of these casinos are located in Las Vegas and other cities. People can gamble at these casinos if they are over the age of 18. Some of the tribal casinos have sports betting and horse racing.

The earliest casinos were built in Nevada and later spread across the United States. As legalized gambling expanded, casinos became a popular attraction for travelers. Some organized crime figures also invested in casinos, taking sole or partial ownership of them and influencing the outcome of some games.

Today, technology is a big part of casino operations. Elaborate surveillance systems provide an eye in the sky that can watch every table, window and doorway, allowing security personnel to detect anything out of the ordinary. Casinos also use electronic systems to supervise the games themselves. For example, in a technique called “chip tracking,” betting chips with built-in microcircuitry interact with the electronic systems of the table to enable casinos to oversee the exact amounts wagered minute by minute and warn them if there is any deviation from expected results.