"Progressive blackjack" is a variation of traditional blackjack that features a progressive jackpot. Players can place an optional bet alongside their standard wager for a chance to win this jackpot by achieving specific hand combinations, like a blackjack. The jackpot grows until someone wins it, adding an extra layer of excitement to the game. The betting structure typically consists of a base bet for the main game and a smaller bet for the progressive jackpot, allowing for potential significant payouts beyond regular winnings.