In blackjack, “Insurance” is a side bet that players can make when the dealer’s upcard is an ace. This bet is essentially a wager on whether the dealer has a blackjack (a 10-value card as the hole card). Insurance is offered before the dealer checks their hole card and can be up to half of the player’s original bet.
If the dealer has blackjack, the insurance bet pays 2:1, which can offset the loss of the original bet. However, if the dealer does not have blackjack, the player loses the insurance bet. While it might seem like a safe option, mathematically, insurance is generally considered a bad bet for players who are not counting cards, as the odds of the dealer having blackjack are not favorable enough to justify the cost of the bet.