A narrow notch, groove or opening, as in a keyway in machinery, or the slit for a coin in a vending machine.

Slot is a game of chance that can be played on an electronic device with reels and symbols. A player inserts cash or, in “ticket-in, ticket-out” machines, a paper ticket with a barcode, and then activates the machine by pushing a button (either physical or on a touchscreen). The reels then spin and stop to arrange symbols according to a pay table. When a winning combination is found, the player earns credits based on the pay table. Depending on the machine, symbols vary from classic fruits and bells to stylized lucky sevens.

Most people enjoy playing slots as a form of entertainment. However, a small but significant subset of gamblers can experience severe gambling-related problems. These problems may include financial debt, issues with interpersonal relationships and professional difficulties. In addition, some gamblers can develop a compulsive need to play, leading to severe problem gambling and associated disorders.

The slot> element is used to define a named slot in XML. Using named slots is useful for creating more flexible layouts. The slot attribute can also be used to create dynamic links between elements.