The sport that features a "yellow card" and "red card" as forms of discipline is soccer. These cards are used by referees to sanction players for various offenses during a match. A yellow card serves as a warning for lesser infractions, while a red card results in the player’s expulsion from the game for severe violations or receiving two yellow cards. This disciplinary system aims to maintain fair play and safety on the field, with players and coaches needing to strategize around potential card impacts during a match.