How does a kicker work in poker and what role does it play in determining the winner of a hand?

In Poker, a kicker is a card used to break ties between players with the same hand ranking. It is the highest card that doesn't contribute to the main hand. The kicker plays a crucial role in determining the winner of a hand when players have the same hand, such as a pair or two pairs. The player with the highest kicker wins the hand.