An online slot is a casino game played on a computer or mobile device. It uses a random number generator (RNG) to generate random sequences every millisecond, which is how the game determines the outcome of each spin.
There are several different types of online slots, with each offering its own unique theme and gameplay. Some are best suited for high-stakes players, while others are perfect for casual players. The differences between these games are also related to the volatility rates, bonus features and other aspects of the game.
One of the most important aspects of any online slot is its RTP – or Return to Player percentage. This number is calculated by comparing the average payout of a game to its total bet amount. This gives a good indication of how often you can expect to win, and is an essential factor to look for when choosing an online slot.
Besides the RTP, the volatility of an online slot is another crucial aspect to consider. The higher the volatility rate, the more likely it is that a given slot will pay out smaller winnings, but will be less frequent overall. Alternatively, lower volatility online slots can be more risky and pay out larger winnings on a more frequent basis.
Some online slot games feature a progressive jackpot, which is a huge sum of money that increases each time someone plays the game. This jackpot is usually displayed above the reels and can be won in the main game, or in a special bonus round. Some of these progressive jackpots are worth millions of dollars. The best online slot games will display the jackpot size on their paytables.
Another important aspect of any online slot is its game controls. The best online slot machines will be simple to navigate, and the controls will be clearly marked on the screen. To begin a spin, simply check the paytable for the highest paying symbols and the available paylines, adjust your bet size and click the spin button. Then wait to see if your luck holds.
If you prefer more sophisticated games, there are online slots with 3-D graphics and other immersive features. These games can be based on movies, TV shows and even rock bands. For example, the newest online slot from Microgaming is the Ted video slot, which is based on the famous film character.
Another popular type of online slot is the Megaways game, which has multiple ways to form winning combinations. These games have a grid format that can range from a traditional 3×3 to 9×9, giving players lots of options for creating combos. Examples of Megaways games include Starburst, Bonanza Megaways, Gonzo’s Quest and 88 Fortunes Megaways. Other popular titles are Cleopatra, Rich Wilde and the Book of Dead and a number of branded slots that use the graphics and sound effects of famous brands.