A data storage medium that is widely used to . . . store data :-)
It is a magnetically coated, flexible disk of Mylar, enclosed in a plastic envelope or case. At one time, floppies were the only medium of data storage for PCs, but the need to store larger amounts of data led to the development of cheap hard disks, CD-ROMs, and Zip Disks, which have become more popular than the little, old floppy.