Topic summary
ISO file

Extracted from the Wikipedia article Optical disc image.
Uses
.iso files are commonly used in emulators to replicate a CD image. Emulators such as Dolphin and PCSX2 use .iso files to emulate Wii and GameCube games, and PlayStation 2 games, respectively. They can also be used as virtual CD-ROMs for hypervisors such as VMware Workstation or VirtualBox. Other uses are burning disk images of operating systems to physical install media.