The "5-card Charlie" rule is a blackjack variation that allows a player to automatically win if they manage to collect five cards in a single hand without busting. Under this rule, if a player successfully achieves this five-card hand, they win the round regardless of the dealer’s total, creating an appealing strategic opportunity. This rule adds an extra layer of excitement to the game, encouraging players to take more risks in pursuit of the five-card bonus while still managing their overall hand effectively. It is not a standard rule in all blackjack games but can often be found in specific casino variations or house rules.