1 min read

What Is a Slot?


A slot is a dynamic placeholder that waits for content to be added to it (passive slot) or that calls out to a renderer to fill it in (active slot). Slots, along with scenarios and renderers, are a key part of how you deliver dynamic content on your web site.

Unlike old three-reel machines, which used to feature simple paylines and one or two types of symbols, modern online slots have many different paylines, different symbol combinations and lots of different bonus features, such as free spins, sticky wilds, re-spins and more. Some slots also have special jackpots and other prize-winning opportunities, which are detailed in the pay table.

The odds of winning at a particular slot are determined by the random number generator (RNG) software in the machine and how it is calibrated to hit a certain percentage of the money placed on it. This percentage is known as the Return to Player (RTP) rate and is typically between 90-97%.

The RTP rate doesn’t tell you how much you’ll win or if you’ll ever win, however. This is because a game’s volatility and betting limits have a significant effect on the likelihood of a winning spin. That’s why you should always read the rules of a slot before playing to get an idea of what the chances are. For example, the pay table will usually explain the rules of how the bonus features work, what the maximum payout is and whether there are any other special terms.