A slot is a dynamic placeholder that either waits for content (passive slot) or actively calls out to a renderer for content (active slot). Like renderers, slots can hold different types of content. But unlike them, slots cannot contain more than one type of content from the Solutions repository.

A machine that displays symbols on a reel and pays out credits when the symbols line up along a pay line. Modern video slot machines can have up to 1024 paylines, allowing multiple combinations to appear on the screen at the same time. Most have one, three, or five visible lines, but some can have as many as nine.

Originally, electromechanical slot machines were operated in saloons by bartenders or owners who accepted cash and tickets that could be exchanged for drinks and cigars. Fey’s machine allowed players to buy the same ticket twice, which was considered a breach of morality and eventually resulted in San Francisco banning them in 1909. Despite this, they remained popular attractions in saloons and bars until the early 1920s, when more-restrictive laws forced them out of business.

A slot can also refer to an expansion slot, such as an ISA (Industry Standard Architecture), PCI, or AGP slot on a computer motherboard. These slots allow for the attachment of various devices, such as hard drives or memory. A slot can also refer to a position in a game that gives the player the opportunity to make a bet or an action.