Back then a laser burned the surface of the CD or DVD in order to record the information on the tracks contained on the optical media’s surface. The term “burning an ISO” is an old legacy of the time when information was “burned” (literally) on CDs or DVDs. Since these ISO images emulate perfectly an optical disk, most operating systems out there are offered through their developer’s website in ISO files, it’s your job then to “burn” these ISO files to a USB stick or memory card and install the operating system from there. In short, ISO images allow you to turn any optimal media into a digital file (something extremely helpful in today’s world where optical media drives are almost nowhere to be found). The format is named after the standard which specifies it, the ISO 9660 standard. An ISO image (also called an ISO file) is a file format standard which allows you to store all the information found in an optical disk, like a CD or a DVD, in a digital file. Nowadays if you want to install an operating system, be it Linux or Windows, most of the time you’ll go to the manufacturer’s website in order to get an ISO image.
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