Disk images are perfect software copies of a physical disk like a CD, DVD or hard disk. A disk image contains all of the data on a physical disk with an identical file structure. The ISO format is a very common format for disk images. Mac programs often use the CDR or DMG format for disk images, however cross-platform downloads as well as CD and DVD disk images may come in the ISO format. The Finder in the Mac OS X operating system can mount ISO images.
Locate the ISO file in the Finder.
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Double-click on the ISO file to mount it.
Go to the "Devices" menu on the left side of the Finder and click on the ISO file to view the contents in the main Finder window.