A "Trump" in card games refers to a suit that is designated to have higher power than the other suits. When a player plays a trump card, it can win over cards from other suits, regardless of their rank. This mechanic is commonly found in games like Bridge, Hearts, and Euchre. The term "Trump" can also refer to a specific card in games where players aim to win tricks. The strategy often involves deciding when to play trump cards to maximize their effectiveness and secure victories in rounds against opponents.