A slot is a narrow opening in something, especially in a machine or container. It can also refer to a position in a schedule or program, as when visitors can book a time slot for a tour of the museum. The word can also mean an opening or position in an organization or hierarchy, as when someone gets a new job or promotion.

Generally, slots are activated by inserting coins or paper tickets with barcodes into an aperture on the machine. This activates spinning reels that then display symbols based on the pay table. A player wins credits if a matching combination appears. The symbols vary by machine and can include classic fruit, bells, or stylized lucky sevens. Most slot games have a theme, and the symbols and bonus features align with that theme. Some have a progressive jackpot that grows over time, while others require a minimum bet to qualify for the jackpot.