The slot is a position on the field where an offensive receiver lines up pre-snap, usually between the last tight end or offensive tackle and one of the outside receivers. The position has been around for a long time, but it has gained in popularity over the years due to the need for offenses to have more than three wide receivers on the field for passing plays. It requires advanced route running and timing skills, as well as an ability to block effectively.

A slit, hole, or narrow opening:

A device that pays out coins according to a fixed schedule:
The term “slot” may also refer to a particular area on the face of a machine where the jackpot prize (or other rewards) are displayed. In addition to the actual jackpot prizes, slot machines often feature other bonus features that increase the player’s chances of winning. These can include free spin rounds, mystery pick games, random win multipliers, and other innovative gameplay elements.