Slot variance, also known as Volatility, measures the expected range between winning and losing. In other words, the variance of online slot machines tells you about the size of your wins and how often you are likely to hit winning combinations. The volatility works only for the long-term play. In a short session, the results of your online slots might vary from the expected variance.
High Variance – Slots with high variance payout big jackpots infrequently. Mostly suitable for players who are willing to take a bigger risk for the chance of substantial profits. Meaning, that the odds to hit a jackpot are substantially smaller and can be rather dull if you are out of luck.
Low Variance – Online slots with low variance pay lots of small and frequent prizes. These are low-risk, low-reward slots and are suitable for players who are looking to go more steadily with their gambling. Though the probability of landing on a winning combination is pretty high, the payouts are not much bigger than your total bet.