Progressive slots are immensely popular and are the key to winning massive amounts of money. They can also cost you a lot of money to play before you win anything because you have to bet the maximum amount (maximum number of coins on all paylines) in order to even qualify for the jackpot prize. Here is how it works; every time a player makes a qualifying bet in a progressive jackpot game, a small part of that bet is placed in a prize pool. This pool keeps increasing until one player hits the jackpot and takes the entire amount accumulated in the pool until that point. This allows the jackpot amount to increase really fast in a short period of time. After the jackpot is won, the pool resets back to its default level and starts accumulating again. Progressive slots come in all shapes and forms; it's possible to to fine a progressive slot in all slots types and categories. The amount of the jackpot varies according to amount of bet placed. The progressive jackpot prize is completely random and can be won at any moment during your play assuming you have placed a qualifying bet. That's why progressive jackpots give you a possibility to win huge amounts of money, and when I say huge, we're talking in millions!