A slot is a narrow opening or groove in a machine, container, or object. The term can also refer to a specific time in which an event takes place, such as when an airplane is expected to take off or land at an airport.

A slots game is a machine that displays reels and pays out credits based on the combination of symbols it shows. A player inserts cash or, in ticket-in, ticket-out machines, a paper ticket with a barcode into the slot. Then the machine activates and spins. Depending on the machine, a player may win a jackpot, be rewarded with free spins or another bonus feature. Most slot games have a theme, such as a specific location or character.

Psychologists have found that players of video slot machines reach a debilitating level of gambling addiction three times more rapidly than people who play traditional casino games. The reason, according to psychologists Robert Breen and Marc Zimmerman, is that video slot machines are designed to keep players engaged with the game for longer periods of time.

The slot is an important area of the ice hockey field. Wingers and centers are most effective in the low slot, because it provides a direct view of the net and allows for wrist shots without a deflection. The slot is also a target for defensemen, because they are more likely to get a good shot off on a player going through the slot.