A floppy disk is a thin, flexible plastic disk with a magnetic coating, usually encased in rigid plastic, once popular for computer data storage and transfer. It has been largely supplaneously to compact discs, memory cards, and USB drives.
Keypunch is a type of data entry where holes are punched into 80-column computer cards in a coded format (Hollerith) that can be machine read by a computer. This method has been largely replaced by electronic keyboard technology.
A punch card is an index card with holes punched in predefined positions to represent data or instructions. Widely used in the 1960s for inputting information into computers, punch cards have since become obsolete, replaced by more advanced interactive terminals and input devices.
