What cards win in poker and how do they determine the winner in a game?

In Poker, the best hand wins. The ranking of hands from highest to lowest is: Royal Flush, Straight Flush, Four of a Kind, Full House, Flush, Straight, Three of a Kind, Two Pair, One Pair, and High Card. If two players have the same hand, the one with the highest-ranking cards wins. If the highest cards are the same, the next highest cards are compared, and so on until a winner is determined.