Shuffle tracking is a technique used by card counters in blackjack to predict the location of specific cards after a shuffle. By observing the shuffle process, players can identify how cards are grouped and track the movement of high-value cards. This allows them to adjust their betting and playing strategies, increasing wagers when favorable cards are expected and reducing them otherwise. Effective shuffle tracking requires keen observation skills and an understanding of the dealer's shuffling techniques, making it a more advanced strategy that can provide an edge, though it can be challenging to execute in a casino setting with various shuffling methods.