A card game is any game that uses playing cards. This could be traditional cards games such as Hearts, Spades, Poker, Euchre, or Bridge, or more untraditional card games such as SET (a card game of visual perception), Bang (a spaghetti western card game), Bohnanza (a crazy bean-trading game), or Modern Art (an auction-style card game).
Interesting card game fact: In the U.S. and Western Europe, card games are played in a clockwise direction. However, did you know that in Eastern Europe, Asia, and South America many card games are played in counter-clockwise direction?