An ISO image is what’s called a disc image - an exact copy of a CD or a DVD disc. ISO files are typically created as CD/DVD backups, but they can also be made “from scratch” using a specialized editor like WinISO. An ISO file can only store a single track of data, so it doesn’t work for music CDs and a few more arcane CD types.

It may help to think of the .iso file like a kind of archive because it usually contains a number of files and folders. However, unlike general purpose archives (e.g. ZIP or RAR), the ISO format saves everything in uncompressed form. Some commercial disc image formats like UIF files and DAA files also support file compression.

To open an ISO image you will need to install one of the many ISO file tools. There’s a multitude of applications that support the ISO files, but most of them are either very expensive or simply lack any defining traits that would let you make an informed choice. So which one should you pick? Depending on your goal, there are two applications that I would recommend.

First, if you only need to extract the file, take a look at 7-zip. It’s a free open-source archiver that can open ISO CD files. It will let you open the CD archive, but that’s it - 7-zip can’t record, mount or create new .iso archives. It’s a neat no-frills application and it works both on Windows and linux systems.

If you want a bit more features you should probably invest in a full-blown ISO image software like PowerISO. Yes, it costs money, but it will let you do practically anything with an ISO or .uif files - open it, modify, mount it in a virtual drive, convert to a different format, and burn to a real disc. PowerISO only works on Windows, though.

To summarize, ISO is a widely known, open DVD archive format that is supported by most CD/DVD applications. Some general-purpose archivers can also extract .iso archives, but they generally can’t do anything else with them.


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