Diskettes are a low capacity, portable, storage medium for computers. They are often used for backup purposes and transporting data when network access is not available.
They come in various sizes ...
- 3.5 inch
- 5.25 inch
- 8 inch
- possibly others
Currently, most computers use 3.5 inch diskettes ... if they have diskette drives at all.
The AS/400 used to use 8 inch diskettes ... but modern computing hardware and techniques have rendered them obsolete.