Punch cards (or punched cards) are paper cards with holes punched by hand or machine to represent computer data and instructions. They are also known as Hollerith cards or IBM cards. It is a stiff piece of paper that holds digital data that is represented by the presence or absence of holes in predetermined locations. Punched cards were historically widely used in data processing and to control automated machinery directly. The data was written on a key punch machine, which punched rectangular holes in the card and (typically) displayed the information along the top so a human could decipher what the holes meant. Punched cards were widely utilised in the data processing business for much of the twentieth century, where punched cards were used for data entry, output, and storage by specialized and increasingly complex unit record machines arranged into automated data processing systems.
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