Progressive jackpot slots are a type of slot machine where the jackpot increases over time as players make bets. A portion of each bet contributes to the jackpot, causing it to grow until someone wins it. These slots can either be standalone, affecting only one machine, or linked across multiple machines or casinos, resulting in much larger jackpots. When a player hits the jackpot, it's usually through a specific combination of symbols or triggering a bonus game. The winning player receives the accumulated jackpot amount, and the jackpot resets to a predetermined base level, starting the accumulation process anew. This format adds excitement and the allure of potentially life-changing payouts, making progressive jackpots popular among casino-goers.