The in house progressive slots
If the gaming company that hosts progressive slots has more than one server hosting hundreds of slot machines, they link all these slot machines via a network to form what is commonly known in gaming parlance as in house progressive slots.
The jackpot paid by these progressive online slots are far more than the one you can get from the normal slots. This is one of the main reasons why the mature online player prefers to play on such machines. If you have never tried it before, it is high time you checked out the progressive slots.