A slot is a dynamic placeholder that either waits for content to arrive (a passive slot) or calls out for it using a renderer (an active slot). A slot contains a set of items and can be filled with a variety of things — from simple text to complex content.

A slit or other narrow opening, especially one for receiving something such as a coin or letter. The pin p in the type-wheel is secured by the cylindrical end that fits in the slot cut in it.

In games, a position in a sequence or series, or the time and place for an aircraft to take off or land at an airport, as allocated by the air traffic control authority: Airport slots are traded and can be very valuable.

In casinos, a machine that has gone a long time without paying out is said to be “due.” This belief causes players to concentrate on the machines at the ends of aisles, which tend to be more popular. However, it’s important to understand that the random number generator is what determines whether a machine will pay out or not and that a slot has no predetermined “due” period. In addition, some slot machines may have special symbols or bonus features that change the probability of a winning spin. Often, these special symbols are Wilds that can substitute for other icons to create a winning combination or unlock bonus levels. They may also act as multipliers to increase the payout of a regular combination.