Five cards of same suit that are ten, Jack, Queen, King and Ace.
A "Royal Flush" is the highest possible hand in poker. It consists of five specific cards: the Ace, King, Queen, Jack, and Ten, all of the same suit (hearts, diamonds, clubs, or spades). For example, a Royal Flush could be A♠ K♠ Q♠ J♠ 10♠. It is an unbeatable hand and is extremely rare in poker games.