A card binder, also known as a trading card binder, is a type of binder used to store and organize trading cards, such as baseball cards, Pokémon cards, or Magic: The Gathering cards. Card binders typically have clear plastic sleeves that allow the cards to be viewed without removing them from the binder, and the binders can be used to store cards of different sizes. Some card binders also have additional features such as special pockets for storing oversized cards, or special dividers to help organize the cards.