Whether it’s an online casino game or a traditional slot machine, the key to winning is the random number generator (RNG). This software program produces hundreds of combinations per second and determines when to spin. It also calculates the expected percentage of payouts over a large sample size. It is tested rigorously by independent testing companies and is a crucial element in ensuring that games are fair.

It’s important to play slots responsibly, and this is why many online casinos have tools that allow players to set spending limits, take brief timeouts or self-exclude for longer periods of time. It’s also important to understand how gambling addiction affects people and to seek professional help if you think you have a problem.

A good way to test your risk tolerance is by playing a game with different volatility levels. High-volatility slots tend to pay out less frequently, but when they do it’s often large amounts. Low-volatility slots, on the other hand, are more likely to pay out smaller amounts regularly.

Another feature to look for is bonus events and bonus buys, which expand your options by allowing you to add extra symbols or reels to a game. These features can increase your chances of winning and help you reach the jackpot faster. They’re particularly popular in progressive slots, which have the added bonus of increasing your winnings if you land a jackpot prize. Branded slots are also a big trend, with games based on movies, TV shows, sports celebrities and rock bands being developed through licensing agreements.