An ISO file is simply a block of data that contains all the information needed to create a CD or DVD. When you burn the ISO *as* an ISO (a common mistake is to do otherwise), you won't get "myfile.iso" on the CD or DVD, you'll get a disk filled with directories, subdirectories, and individual files, ready to read and go.
(That's assuming that everything goes well during the write, of course. And the "common mistake" is to accidentally burn the ISO as a *file* to disk -- and you can always tell when you've done this, because after burning, you'll insert the disk, do a directory, and see only "myfile.iso" on the CD or DVD!)