Any file that ends in .iso is an exact copy of a disk. It's a virtual copy of a CD or DVD, with the same file structure and the same data. ISO copies are referred to as "images" of the original.

Perhaps it's a trick of memory, but it seems like old media formats simply evaporate once we move on to the next big thing. The recording industry sold 4.4 billion dollars worth of 8-track tapes ...