In poker, what hand consists of five cards of the same suit in sequence?

In poker, a hand consisting of five cards of the same suit in sequential order is known as a straight flush. This powerful combination gets its name from two simpler poker hands: a "straight," which is five cards in sequential rank regardless of suit, and a "flush," which is five cards of the same suit but not necessarily in order. When these two elements combine, such as the 5, 6, 7, 8, and 9 of hearts, you have a straight flush.

The straight flush is an exceptionally rare and strong hand, ranking as the second-highest possible hand in most poker variants. Its rarity contributes significantly to its high standing; the probability of being dealt a straight flush in a standard five-card hand is approximately 1 in 72,193. Only one hand can beat a straight flush: the royal flush.

A royal flush is, in fact, a specific type of straight flush, consisting of the highest possible sequential cards of the same suit: the Ace, King, Queen, Jack, and Ten. This makes the royal flush the ultimate and unbeatable poker hand. When two players both have a straight flush, the hand with the highest-ranking card in its sequence wins. For instance, a straight flush of 10-9-8-7-6 would beat a 9-8-7-6-5 straight flush, regardless of the suit.