Card counting is a technique used in blackjack to track the ratio of high to low cards remaining in the deck, helping players adjust their bets and decisions. However, it doesn't work in poker because the game involves a shuffled deck for each hand and community cards shared by all players, making it difficult to track cards effectively. Poker is more about skill, strategy, and psychology, with success relying on bluffing, reading opponents, and adapting to the game rather than tracking cards.