ISO files or ISO images are archive files consisting of an exact copy of an entire disc. These files are smaller than the files contained on the original discs, allowing you to conserve memory while storing them.
If you’d like to burn data from one disc to another but do not have a blank disc available, you can first convert the original disc into an ISO file and store it on your computer. Then, once you obtain a blank disc, you can burn the ISO file to the disc.