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Brief facts about punchcard:

A punched card is a piece of card stock that stores digital data using punched holes. Punched cards were once common in data processing and the control of automated machines. Punched cards were widely used in the 20th century, where unit record machines, organized into data processing systems, used punched cards for data input, output, and storage. The IBM 12-row/80-column punched card format came to dominate the industry. Many early digital computers used punched cards as the primary medium for input of both computer programs and data. Data can be entered onto a punched card using a keypunch. While punched cards are now obsolete as a storage medium, as of 2012, some voting machines still used punched cards to record votes. Punched cards also had a significant cultural impact in the 20th century.

Aperture card - An aperture card is a type of punched card with a cut-out window into which a chip of microfilm is mounted. Such a card is used for archiving or for making multiple inexpensive copies of a document for ease of distribution.

Book music - Book music is a medium for storing the music played on mechanical organs, mainly of European manufacture. Book music is made from thick cardboard, containing perforated holes specifying the musical notes to be played, with the book folded zig-zag style.

Card image - Card image is a traditional term for a character string, usually 80 characters in length, that was, or could be, contained on a single punched card. IBM cards were 80 characters in length. UNIVAC cards were 90 characters in length.

Computer programming in the punched card era - From the invention of computer programming languages up to the mid-1970s, most computer programmers created, edited and stored their programs line by line on punch cards.

Edge-notched card - Edge-notched cards or edge-punched cards are a system used to store a small amount of binary or logical data on paper index cards, encoded via the presence or absence of notches in the edges of the cards.

History of computing hardware - The history of computing hardware covers the developments from early simple devices to aid calculation to modern day computers.

Legacy hardware

IBM storage devices

History of software

History of computing hardware