What is a Slot?

A narrow slit or opening, especially one for receiving something, such as a coin or letter. Also used: a position in a group, series, or sequence. See more at Webster’s Online Dictionary

(Australian rules football, rugby) An unmarked area in front of the opponent’s goal that allows a player to gain a vantage position to kick the ball into the net.

A slot is a term used in aviation for an allocated time and place for aircraft to take off or land as authorized by an airport or air-traffic control authority. The number of slots available for each type of aircraft is limited, and airlines compete to secure the best slots.

A slot is also the name of a position on a computer motherboard, usually reserved for expansion cards, such as an ISA or PCI card, and may also refer to a memory slot. Some types of slot are designed to accommodate multiple kinds of expansion cards, and are therefore called multi-slot or multi-function slots. In contrast, other types of slot are designed for a specific kind of expansion card, and are therefore called single-slot or single-function slots.