Definition of Quads
A Quads is in French, a square. We get a square when we have 4 cards of the same denomination. For example, when a player has a pair of 5's on 5-5-2, he has a Quads. A Quads is a very rare hand. Even if you have a pair in your hand, you will only hit a Quads on flop only 0.24% of the time. And you will have a pair in hand once every badbeat jackpot hands. That's how rare it is! The good news is that it's an almost unbeatable hand. Even if you play a lot on poker, in your whole life, you could lose 2-3 times maximum with a quad. And we're talking about a player who puts up a good volume!
Quads and badbeat jackpot
Some of the poker halls offer progressive groslots that they call "badbeat jackpot". If you lose at one of these tables with a minimum of an 8 (it can be a 9 or 10 or Jacks, depending on the room) and you have a pair in your hand, you will split the current progressive jackpot between all the players at the table. The loser of the hand will get 50% of the jackpot, the winner of the hand 25% and all other players at the table will split the remaining 25%.