Royal flush: Ace, King, Queen, Jack, Ten of the same suit.
Straight flush: cards of the same suit in number sequence.
Four of a kind: cards of the same value (e.g. four aces)
Full house: three cards of one value, two of another (e.g. three aces, two kings)
Flush: all cards are of the same suit
Straight: cards are in number sequence, but not of the same suit
Three of a kind: three cards of the same value
Two pair: two pairs of cards with the same value (e.g. king, king and ace, ace)