A card is provided having structure, such as a teeth-like pattern, tongue and groove, etc., along at least one edge thereof. The structure is configured for matching or mating with a corresponding similar pattern along at least one edge of another card for selectively attaching and detaching the two cards. The card can be a credit card or other type of card having at least one magnetic stripe for effecting payment for purchases. The card can also be other types of cards, such as gift cards, library cards, identification cards, etc.