What is Cards?

Cards, in their most basic form, are small, typically rectangular pieces of stiff paper, cardboard, or plastic. They are used for a vast range of purposes, including playing games (like poker or bridge), collecting (like baseball cards), identification (like ID cards), access control (like key cards), and information display (like business cards). The specific properties and functionalities depend heavily on the type of card; for example, playing cards are designed for shuffling and dealing, while credit cards contain embedded technology for electronic transactions.