Deck-building games are a type of card game where players start with a small set of cards and gradually build a more powerful deck by acquiring new cards from a shared pool. Players draw cards from their decks to perform actions, gain resources, or score points, with the goal of improving their deck's efficiency and effectiveness over time. These games often involve strategic decision-making, as players must choose which cards to buy and when to play them. Popular examples of deck-building games include Dominion, Ascension, and Star Realms, each offering unique mechanics and themes to enhance gameplay.