Players can use the dealer's upcard to inform their strategic decisions by assessing the potential strength or weakness of the dealer's hand. A strong upcard, such as a 10 or Ace, often suggests that the dealer has a good chance of making a strong total, prompting players to play more conservatively and avoid risky actions unless they have strong hands. Conversely, if the dealer shows a weak upcard like a 2 through 6, players might adopt a more aggressive strategy, opting to hit or double down with lower totals, as the dealer is more likely to bust.