A floppy disk, also called a floppy, diskette, or just disk, is a type of disk storage composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic enclosure lined with fabric that removes dust particles.
In the late 1980s, the 5.25-inch floppy disk was on its way out and in 1987 the 3.5-inch floppy disk had moved into the high density category with a capacity of 1.44 MB. You would need 711 1.44 MB floppy disks to equal 1 Gigabyte.
For more than two decades, the floppy disk was the primary external writable storage device used. Most computing environments before the 1990s were non-networked, and floppy disks were the primary means of transferring data between computers, a method known informally as sneakernet.
Unlike hard disks, floppy disks are handled and seen; even a novice user can identify a floppy disk. Because of these factors, a picture of a 3½-inch floppy disk has become an interface metaphor for saving data. The floppy disk symbol is still used by software on user-interface elements related to saving files, such as the release of Microsoft Office 2013, even though the physical floppy disks are largely obsolete.