Definition
A Hollerith card, also known as a punched card, is a stiff paper card containing digital information represented by the presence or absence of punched holes in predefined positions. It was an early form of digital data storage and input, used extensively in computing and data processing. Think of it as a primitive form of a USB drive, but made of paper. Unlike modern storage, data is physically encoded by holes. It was a key technology in the early days of computers.