Definition - What does Zip Disk mean?
Techopedia explains Zip Disk
Zip disks were PC and Mac compatible. They were usually used as secondary storage devices. Zip disks had faster data transfer rates and faster seek times than floppy disks. At the height of their popularity, they were preferred for backing up hard disks and for transferring large files, especially image files. They were less vulnerable to damage and were much stronger and more durable.
Zip disks, however, were expensive in comparison to floppy disks and needed a Zip drive to be used. Zip disks were also vulnerable to click-of-death issues, resulting in data loss.