ISO files are usually CD or DVD disc images based on the ISO-9660 standard. This standard was published by the International Organization for Standardization and it is the accepted standard disc image format. ISO files contain duplicates of data that have been created from an original computer disc. These files are commonly used when duplicating or creating back up copies of CDs and DVDs.
The .iso file extension is also used by InstallShield software. This software is used to create installers for a variety of software packages. The ISO files used by this installer contain images of the program being installed on a user's computer.
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