What is a nut flush?

A nut flush is a poker hand that consists of five cards of the same suit, with the highest possible card being an ace. This is considered the best possible flush as it cannot be beaten by any other flush. In Texas Hold'em, if the community cards on the board make a nut flush possible, the player holding it will have the strongest hand possible in that situation. Nut flushes are very strong hands and can often lead to big wins in poker games.