A slot is a dynamic placeholder on your Web page that waits for or calls out to content. A slot can hold a single content item, a group of items (a scenario), or a collection of repository items. Slots work with scenarios and renderers to deliver content to your Web site.
Modern slot machines look a lot like their older mechanical counterparts, but they operate differently. They use computers rather than gears to control the outcome of each spin. This is why the odds for winning are different than for other casino games, and why they can pay out massive, lifestyle-changing jackpots.