The shuffle tracker technique is a card-counting strategy used in blackjack where players try to predict the order of cards after a shuffle. By observing the way cards are shuffled, they look for patterns or clusters in the deck, such as groups of high or low-value cards that may remain together. The tracker then uses this information to anticipate which cards are likely to appear next, adjusting their bets accordingly. The technique requires keen attention and practice, as well as an understanding of the specific shuffling method used by the casino. However, it has limitations, especially with automatic shuffling machines and casino surveillance, which can detect and counteract the strategy.