A slot is a narrow opening, especially one that accepts a coin or a letter.

In a casino, the room is filled with beeps and bells, and well-dressed men and women push buttons and pull levers while watching cherries and sevens spin on liquid crystal displays. These are not gamblers in search of fun; they are serious businesspeople, trying to get a leg up on the competition. They are trying to win a jackpot, and their success is determined by how much time they spend playing video slots. A report by psychologists Robert Breen and Marc Zimmerman found that people who play slots reach a debilitating level of involvement in gambling three times more quickly than other gamblers.

The word slot may also refer to:

In computing, a logical position in the memory of a computer that is reserved for a specific program or data item. A slot is usually used to hold information needed for processing by the CPU, but can also be used to store variables or other data. Slots are usually accessed via the CPU registers, but can be accessed directly as well. See also RAM.