A card game is a game that involves the use of a deck of cards as the primary component for gameplay, regardless of whether the game is played physically or digitally. In a physical card game, the deck of cards is usually made up of paper or plastic and the game is played using physical cards. In a digital card game, the deck of cards is usually represented virtually and the game is played using a computer, mobile device, or other electronic device. Examples of popular digital card games include Hearthstone, Magic: The Gathering Arena, Yu-Gi-Oh! Duel Links, and Gwent: The Witcher Card Game. Despite the differences between physical and digital card games, they share a common foundation of using a deck of cards to play and enjoy the game.