The insurance bet in blackjack is offered when the dealer shows an ace, allowing players to wager on the possibility of the dealer having a natural blackjack. While it may seem like a protective option, most blackjack strategies advise against taking insurance because it statistically favors the house. The payout of 2:1 does not compensate for the low probability of the dealer having a blackjack, leading to an overall negative expected value. For experienced players, avoiding the insurance bet is generally the better long-term strategy, as it prevents unnecessary losses.