Live Linux CDs are also great when your operating system is damaged and you can’t boot it. In this case you just boot a Live Linux distro and you can access your files.
3 KDE Live Linux CDs I Recommend
Live Linux distros are not news anymore and there are many of them worth trying. Depending on what you need a live CD for, the list would be different. These 3 distros — Mepis, Kubuntu, and PCLinuxOS are more or less general purpose distros and they are suitable even for beginners. The 3 distros use KDE as a desktop environment but if you are not a fan of KDE, the choice of Live Linux distros with Gnome, LXDE, and other desktops is pretty impressive.