Positive and negative counts in card games, particularly in blackjack, influence player strategy by signaling the likelihood of favorable or unfavorable outcomes. A positive count suggests more high cards remain in the deck, which increases the chance of getting strong hands like blackjacks and improves doubling down opportunities. Players may bet more aggressively or modify their strategy accordingly. A negative count, indicating more low cards, encourages more cautious decisions, as the chances of dealer busts or strong player hands decrease.