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A royal flush is a poker hand where every card is 10 or above of the same suit. The probability of this with any single suit is 1/649,740 and the probability of getting a royal flush in a specific suit is 1/2,598,960.
Other poker hands:
Flushes and straight flushes are easier to get. Both of them requires the same suit and the cards of straight flushes specifically need to be in order. A full house is two cards of one rank and three cards of another rank. There's also four of a kind and three of a kind, as well as two pair and one pair.