In Blackjack, players utilize the concept of variance to gauge the potential fluctuations in their results over time. Variance reflects the degree of deviation from the expected outcome, highlighting that while players can have winning or losing streaks, the results can be unpredictable in the short term. Understanding variance helps players recognize that even a sound strategy may yield inconsistent results due to luck and chance. This awareness allows them to manage their bankroll effectively, set realistic expectations, and avoid emotional reactions to temporary losses or wins. By embracing the notion of variance, players can approach the game with a more calculated mindset, balancing risk and reward while minimizing the impact of short-term variability on their overall strategy.