a single file containing all the information (data) required to create a DVD, including the menu structure
a special file that contains all the DVD information but has no directory structure
A single large file which is an exact representation of the whole set of data and programs as it will appear on a CD, in terms of both content and logical format. This may be an ISO 9660 image (adhering strictly to the ISO 9660 standard), or some proprietary format such as the .cif format used by Easy CD Creator.
A file that contains all of the data needed to create a CD. Disc images can be mounted and browsed like any other volume.
One large file that represents an entire set of data and programs that will appear on a disc, including content and structure.