Progressive slots are slot machines that accumulate towards one more jackpot over and above any amount that you could actually win on the equipment. A small portion of each player's bets go towards this jackpot. Hundreds of excellent online slot gambling sites offer the same progressive slots, and the progressive slot wager portions from all of these sites are centrally pooled to make up the grand jackpot, which is often won by playing at any of these sites. At land-based casinos the same principal applies, the main difference being that a range of physical slot machines are linked together to form a progressive slot machine network, paying out a progressive slot jackpot beyond the payouts that each machine makes to players on their own own.

You can find 3 kinds of progressive slot machines in real-world casinos.