What Is a Slot?


A narrow opening, usually a hole, in something such as a door or window. Also used for the space in a schedule or program where an activity can take place, as when visitors reserve a time slot a week or more in advance. Also, the position or job held by someone: He was promoted to the slot as chief copy editor.

In a slot machine, a slot is the area where the player inserts cash or, in ticket-in, ticket-out machines, a paper ticket with a barcode. A microprocessor inside the slot machine then assigns a different probability to each symbol on each reel and arranges them randomly in a set of symbols on each spin. The player wins if the symbols line up in a winning payline. Many slot games have special features like regular and wild multipliers, progressive multipliers (like 2X or 3X), bonus rounds, re-spins, and more.

A slot is a dynamic container that can either wait for content to be added to it (a passive slot) or call out to a renderer to fill it with content (an active slot). The name of the slot is specified by a tag in a slot> element. Slots and scenarios work in tandem to deliver content to a page; renderers specify the presentation of that content. Using slot-based scheduling can improve efficiency in the workplace by making it easier for staff members to track urgent deadlines and keep project teams on target to meet those dates.