What Is a Slot?


A thin opening or groove in something, such as a coin slot in a machine or the mail slot at the post office. Also called hole, slit, aperture, vent, or window. She slotted the filter into the machine.

In casino gambling, a slot is the amount of money a machine pays out in one spin. This value is often expressed as a denomination or price, such as penny slots or nickel slots. The higher the denomination, the bigger the payout.

Originally, mechanical slot machines (and pub fruit machines) offered only one payline per reel. Today, electronic machines can have many paylines in horizontal, vertical, diagonal, and zigzag patterns for multiple ways to win. Some even have wild symbols that substitute for other symbols to create winning lines.

Some players believe that a machine that has gone long without paying out is “due.” However, it’s more likely that the machine has a lower payout percentage than the others in the same location. This is why casinos often place the most popular machines at the ends of aisles, where they’ll attract the highest number of players.

In ATG Personalization, slots act as dynamic placeholders that wait for or call out content dictated by a scenario or other trigger element. In addition, slots have several important properties that you should be familiar with. To learn more, see the Using Slots chapter in the ATG Personalization Programming Guide.