The Connected Progressive Jackpots are an upgrade of the games with Stand Alone Jackpots in terms of offer.
In this case, you can have a series of games in the same casino that are connected to each other. This means that whenever the machine that a user bets on of any of these connected games, the Jackpot increases in all of them.
No matter which game you play you are always contributing to the same Jackpot prize.
For example, Casino 888 has a number of games produced in-house on its website that are not available in other casinos and that are linked by a common Jackpot.