Volatility describes how a slot's payouts are distributed. Low means frequent small wins, high means rare but large ones. It is one of the key specs to check before your first bet.
Low volatility
The balance grows slowly and steadily, sessions are long and sharp drawdowns are rare. Good for beginners and for players who value a steady stream of small wins. Examples: Starburst, Candy Dreams.
Medium volatility
The golden middle: moderate frequency and moderate win sizes. Many modern slots — from Koi Gate to 5 Lucky Lions — balance right here.
High volatility
Wins are rare but can be huge. Your bankroll must stretch over more spins, and long streaks without payouts are possible between bonuses. Examples: Book of Ra Deluxe, San Quentin 2, Wild Falls.