A slot is a dynamic placeholder that either waits for content (a passive slot) or calls out for it (an active one). Slots work in tandem with scenarios, which reference repository items and specify how those items are presented to the page.
There are a lot of different types of slots, and each type offers its own unique gameplay experience. However, all slots have a few things in common. Typically, they have reels that spin and symbols that appear on them. The aim is to line up matching symbols along a payline to win. Some slots also have additional features, such as Wild Multipliers, which increase your chances of winning without paying extra. Others have progressive multipliers, which rise as you play, or a free spin bonus.