Although live CD is really famous, there are still a lot of people that do not know about it. What is live cd? Actually, live cd is a type of bootable cd that contains operating system. Live cd is very useful especially in troubleshooting and repairing and your PC.
Since live CDs have their own operating system, they do not need the OS inside your hard disk (ex: xp, linux, vista) to operate. Imagine that your PC has error and can’t load windows. For most people, they either format it or make it as slave in other PC. However, perhaps the PC only has software issue and only need a few click to settle it.