Here is a rank of hands for the game of poker from highest ranking to lowest.
The best possible hand - an Ace, King, Queen, Jack, and 10 of the same suit
Five cards of the same suit in sequential order.
Four of a Kind
Four cards of the same value.
Three of a kind and a pair. In the event of a tie, the player with the higher value three-of-a-kind wins. If both players have the same three-of-a-kind then the player with the highest pair wins.
A hand containing five cards of the same suit. If two players both have a flush, the player holding the highest valued cards wins. For example, a King-high flush beats a Queen-high flush.
Five cards of any suit in ascending order. The ace can be either high or low. In the event of a tie, the higher straight wins.
Three of a Kind
Three of a kind is simply three cards of the same rank.
Two sets of pairs. If more than one player has two pair, the player holding the highest pair takes the pot. If both players are both holding the same two pair then the player with the highest kicker (i.e. 5th card) wins the pot.
Two cards or the same rank.
The highest card wins the hand if no player is holding a pair or better. It is not uncommon for a High Card to be the winning hand when playing heads-up.