Whether you’re playing online slots for real money or simply to pass the time, there are some important concepts to understand before you hit spin. Unlike other casino games, there’s not much skill involved when it comes to winning slots; the results are completely random thanks to the use of a random number generator (RNG) that is regularly audited for fairness. However, that doesn’t mean you don’t have to put in some effort to improve your chances of a big win.

There are a few mathematical factors that affect how likely you are to win in an online slot, including its RTP and volatility/variance. The RTP indicates how much money a slot machine is expected to return to players over an extended period of time, while the volatility is what determines how often and how big your wins are.

Another thing to consider when choosing an online slot is its theme. The right theme can make all the difference in your gaming experience, so take a look at the selection at top online casinos and find out which ones speak to you.

Some of the most popular slot themes include branded titles, fairy tales, and TV shows, with a variety of symbols to choose from. But there are plenty of other options as well, including special symbols, scatters, and bonus rounds. You can also try out 3D slots that incorporate advanced graphics and sound effects for a more realistic gaming experience.