What does 3.5-Inch diskette mean?

3.5-Inch diskette meaning in Computer Science Dictionary

A 3.5-inch diskette was first created by IBM in 1984 with a preliminary ability of 720KB and soon after 1.44MB that changes 5.25" diskettes. These disks had been the absolute most widely used techniques to back up and store data within the 1990s, but by 2000 had been seldom used or found aided by the introduction of CD-R disks and soon after USB flash drives.