Volatility, also called variance, describes how a slot pays out over time: low-volatility games return smaller wins often, while high-volatility games pay rarely but for much bigger amounts.
A $100 bankroll on a low-volatility slot tends to drift up and down in small steps over a long session. The same $100 on a high-volatility slot can vanish in twenty spins with nothing to show for it, or hit a bonus round that turns a $2 stake into $400.
Two slots can both carry 96% RTP. A low-volatility version might pay out on 1 in 4 spins with an average win of 0.5x the bet, while a high-volatility version pays on 1 in 12 spins but averages 6x the bet when it hits, reaching the same long-run payback through very different sessions.
House Edge is the mathematical advantage the operator holds over a player in any specific game. Represented as a percentage, it indicates the portion of every wager the house is statistically guaranteed to retain over time. This built-in margin ensures the venue remains profitable regardless of individual short-term wins. While players can use strategy to minimize this gap in games like Blackjack or Video Poker, the edge is a permanent fixture of all casino products, serving as the cost of the gambling service provided. A 2% edge means the house expects to keep $2 for every $100 played. For players, finding games with the lowest house edge, like Blackjack or certain online slots, is a key gambling strategy to improve the odds of winning. Essentially, the lower the edge, the better your chances are of keeping your bankroll alive.
RTP is the percentage of total money wagered on a casino game that the game pays back to players over the long run, worked out across millions of simulated spins rather than any single session.
A bonus round is a separate feature within a slot game, triggered by landing specific symbols, that breaks from normal spinning to offer free spins, pick-a-prize screens, or other mini-games with a shot at bigger payouts.