A progressive jackpot is a jackpot that increases each time the game is played but the jackpot is not won. When the progressive jackpot is won, the jackpot for the next play is reset to a predetermined value and resumes increasing under the same rule.
Many slot machines and video poker machines feature a progressive jackpot. The jackpot increases by a small predetermined amount each time the game is played. Often multiple machines are pooled or linked together to form a larger progressive jackpot which grows more quickly because more non-winning plays can be counted toward it.