Explain me what Punch Cards?

Submitted by: Muhammad
For operating fairground organs and related instruments. It was used through the 20th century in unit record machines for input, processing, and data storage. Early digital computers used punched cards as the primary medium for input of both computer programs and data, with offline data entry on key punch machines. Some voting machines use punched cards.
Submitted by: Muhammad

Read Online Data Entry Job Interview Questions And Answers