Shuffle tracking is a card counting technique used by players to gain an advantage over the house in casino games like blackjack, roulette, and baccarat. It involves observing the cards as they are shuffled and tracking the specific cards or patterns in the deck to gain an edge. By monitoring the cards that are dealt and using their knowledge of the shuffle process, players can make informed decisions about which cards to play, which to hold, and when to bet or fold. This allows them to increase their chances of winning and potentially gain an advantage over the house.