In Blackjack, a "hard hand" refers to a hand that either doesn't contain an Ace or contains an Ace that is counted as 1, rather than 11. This means the hand doesn't have the flexibility that comes with an Ace being valued at 11, making the hand less adaptable. For example, a hand with cards like 8-9 or 10-6 would be considered a hard hand because they total 17 and 16, respectively. In contrast, a "soft hand" involves an Ace being counted as 11, such as in a hand like Ace-6, which can total 17 without risking a bust.