Online slot is one of the most popular casino games. It can come in many different forms, from simple classic three-reelers to the latest Megaways slots. There are also a variety of bonus features that can add an extra layer to the game.

But how do these slots work? The answer to this is a piece of software called the Random Number Generator (RNG), which ensures that results are completely random. The RNG uses an algorithm to generate thousands of numbers every second, and the one that’s generated at the time you press ‘spin’ is the outcome for that spin.

As for the symbols, they’re usually arranged on a reel and can award payouts based on their rarity. Some slots have special symbols called Scatters that can trigger additional bonus rounds or multiply your winnings. They don’t have to appear on an active payline to award a win, but are still worth checking out.

There are also a range of different themes to choose from, from Ancient Egypt and Norse mythology to hit TV shows, movie titles and famous musicians. These dazzling graphics are what attract players to slots, but you should also keep an eye on the RTP and volatility of each game before making a decision.

Another important factor to look at is how often and how much a slot pays out. Some slots have low volatility rates that offer frequent small wins, while others have high RTPs with fewer big wins but a higher chance of winning them. This is why it’s important to play at a licensed online casino and look for the Return to Player rate and variance figure for each game.