What does a referee's yellow card signify?

A yellow card in sports like soccer (football) is a formal caution given by the referee to a player for misconduct or rule violations. It serves as an official warning, signaling that the player's behavior or action was unacceptable but not severe enough for immediate ejection. Common reasons include unsporting behavior, persistent fouling, time-wasting, or dissent toward officials. If a player receives two yellow cards in the same match, it results in a red card, meaning they are sent off the field and their team must continue with one fewer player.