As generally a small flat object, typically made from heavy paper or plastic card may refer to:

• Business card, a wallet sized card containing contact information for a person or business.
• Computer card, a computer hardware component, such as a sound card.
• Credit card, a plastic card for buying things on credit
• Debit card, a plastic card for buying things using money in a bank account
• Expansion card, a device attached generally inside a computer, that provides added functionality, such as a graphics card or a sound card
• File card, a metal brush used to clean the cutting grooves on files
• Greeting card, usually folded paper that is mailed or given to a relative, friend, or associate to express a message of greeting, appreciation, or some other sentiment
• Health card, a token to be used as patient data card (PDC) or health professional card (HPC)
• ID card, an identity document
• Index card, a card for creating and organizing notes in a stack, usually for a research project
• Penalty cards for rule violations in several sports, e.g. red card or yellow card
• Playing card, a card, typically made of laminated paper, used for playing games
• Postcard, a card used for sending messages in the mail without use of an envelope
• Punch card, an obsolete method for storing data
• Raising card, a spiked brushlike tool used in wool- and clothmaking
• Smart card, a plastic card containing a computer chip (also known as a Key Card)
• Trading card, a card used for trading or collecting, or for use in a collectible card game
• Value card, a self-help device listing behavior changes the bearer wants to make
• Cigarette card, a trading card used to reinforce cigarette packaging

Non-physical analogues of physical cards: