Full explanation — Kicker
A kicker is the highest card outside the hand itself that decides a showdown when two players have matching main hands, such as the same pair or two pair. Instead of splitting the pot, the player with the higher-ranked side card wins everything. Kickers matter most with one-pair and two-pair hands, and skilled players pay close attention to kicker strength when deciding whether a hand is strong enough to call or value bet, since a weak kicker can turn an apparently strong hand into a losing one.