A Linux ISO is a file that contains a complete copy of a Linux distribution, including the operating system, applications, and other files. It is used to install Linux on a computer or to create a bootable USB drive.
Linux ISOs are important because they provide a way to install Linux on a computer without having to download the individual files that make up the distribution. ISOs are also useful for creating bootable USB drives, which can be used to install Linux on computers that do not have a CD or DVD drive.