An ISO file is a CD or DVD image file. In order to attach an ISO file to the local file system, you have to mount it with a loop device. A loop device is used to make a regular file look like a block device.
The mount command is used to mount the device to the local file system.

mount -o loop,unhide,ro -t iso9660  
mount -o loop,unhide,ro -t udf

The “-o” option specifies extra parameters

loop use a loop device
unhide show hidden files
ro mount filesystem as readonly

The “-t” option specifies the filessytem to mount.

iso9660 CD-ROM filesystem
udf DVD Filesystem

The source parameters is the ISO.file. The target is the mount stub where the ISO file will be attached to the local filesystem.

Anatomy of the Linux file system

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