Progressive Slots offer some of the largest possible jackpots in online gaming. These slot machines run a slots game with a jackpot pool that all players share. Each time a Progressive Slots game is played, a small portion of the players' bet is added to the jackpot pool. Over time the jackpot pool grows, in some cases to hundreds of thousands of dollars! Anyone playing a Progressive Slots game can win the entire jackpot pool at any time, although of course, the more the jackpot rises, the more players will try and win it!

Progressive Slot versions of both classic Casino Slots and modern Video Slots are available, sometimes with both versions sharing the same jackpot pool. The main difference in Progressive Slots is between games with a jackpot that only pays out very rarely, usually resulting in very large progressive jackpots, or games where the jackpot is paid out more frequently, usually resulting in far smaller, but more frequent, progressive jackpots.