Images of floppy disks have existed since the DOS days, primarily through backup software, often with compression applied to reduce the size of the image file. This means that even the boot sector is contained in the image file, and hence if you restore the image back onto an original floppy disk it would boot just as the original did! It also contains empty sectors if those sectors were empty on the original media. They are called "images" because typically the file contains a direct 'image' of each sector that existed on the original media. A disk image is simply a single file that contains an entire floppy disk's data.
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