When playing slots online, you need to be prepared for the unexpected. While many players have tried to cheat the machines by tracking symbols or manipulating the lever to win, the truth is that online slot machines are random and your winnings are entirely up to chance. Online slots use a random number generator (RNG) to determine winnings and pay outs.

Many of the online slot games use the same basic concepts as the classic big screen versions. However, many of these slots are different and may not have two bonus games or two bonus rounds. Using an online slot review will help you win, and avoid pitfalls. Many paytables are based on old, outdated themes. For example, many slot studios have copied popular Native American animals or cows running toward players.

Themes are another important feature of online slots. These themes can come from movies, TV shows, and computer games. Some online slot games offer themes from world history. Others are based on famous places or cities. Themes are often adaptable to mobile devices, so you can play them on your iPhone or desktop computer, for instance.

Online slot casinos must be licensed by an independent authority to ensure the fairness of games. A site that is licensed should display its license in the footer. Also, check the Return to Player (RTP) of the game before entering your money. Seeing this number is essential to the fairness of the gameplay.