Could anyone please help me in understanding what an ISO image is? I am asking this question for I have recently downloaded the Avira Rescue System 2014 and in the description I read that an ISO image is to be automatically burned on a CD or in a USB Stick by the application: " Die im Download enthaltene Anwendung brennt selbstÃ¤ndig ein ISO-Image auf USB-Stick oder einen CD- oder DVD-Rohling. Von diesem Medium mÃ¼ssen Sie Ihren PC dann starten."
BTW I have also downloaded the Rufus 1.4.12, which also deals with ISO images and boot from USB, but I still cannot fully realize what all this means. The OS boots from the USB? And what next, if it is so? It goes on running from the USB (or the CD) for the rest of the session? What is the main purpose of all this?
May sound utterly newbyish all this, but nevertheless I had to ask somewhere, for I’m burning in curiosity about this…