Kicker

A card used to break ties. If both players have a pair of Aces, the player with the next highest card wins the pot.

In draw poker, a side card (one of a different rank) held, when drawing, with a pair or three of a kind, to disguise the hand or to try to improve the hand. In hold'em, the unpaired card that goes with a player's pair or three of a kind. Often, the rank of the kicker determines the winner of the pot.