What means provide ISO file

What is an ISO file?
An ISO image is a computer file that contains a memory image of the file system of a CD or DVD.
The file system is copied unchanged when an ISO image is created, thus permissions and other metadata remain unchanged.

What are the advantages of an ISO file?
With virtual drives you don't have to search for the physical copy of the medium before using it. For example, you can create an image of your operating system DVD and store it on the device. You can then use this image for system repairs or new installations if necessary.
The direct data transfer via USB 3.0 is much faster than with normal CD/DVD drives.

The following devices can provide ISO files.