A "Red Card" is a disciplinary tool used in sports, particularly in soccer, to indicate that a player has committed a serious foul or misconduct. When a player receives a red card, they are immediately ejected from the game and cannot be replaced, leaving their team with one fewer player. This action is taken to maintain fair play and ensure the safety of all participants. In addition to the immediate consequences of being sent off, a player who receives a red card may also face further penalties, such as suspensions for future matches. The referee has the authority to issue a red card based on their judgment of the severity of the offense, which can include violent conduct or using offensive language.