What is a Slot?

A slit or other narrow opening, especially one used for receiving something, as a coin or a letter. Also: a position, assignment, or job opening: He got the slot as chief copy editor of the Gazette.

In a slot machine, a person inserts cash or, in “ticket-in, ticket-out” machines, a paper ticket with a barcode, into a designated slot. The machine then activates reels that hold symbols and, if a winning combination is made, pays credits based on the paytable. Symbols vary by machine, but classics include fruits, bells, and stylized lucky sevens. Most slot games have a theme, and the symbols and bonus features align with that theme.

A’slot’ is a dynamic placeholder on a Web page that either waits for content to be added to it (a passive slot) or calls out to a renderer to fill it with content (an active slot). Slots and scenarios work in tandem with each other to deliver content to the page; rendering determines how that content is presented.