A ‘jackpot’ we would usually refer to as a non-progressive jackpot. I.e., the slot will have a set of jackpots that are fixed, also known as a fixed jackpot. Some games like Basic Instinct by iSoftBet have 1 progressive jackpot while others will have multiple jackpots built-in with fixed payouts. On the other hand, a progressive jackpot grows with every spin until it is triggered or randomly pays. The reason its jackpot can grow so high is that a percentage of every bet contributes to the jackpot, whereas fixed progressive jackpots are worked out using a mathematical algorithm.