''A live CD (also live DVD, live disc, or live operating system) is a complete bootable computer installation including operating system which runs directly from a CD-ROM or similar storage device into a computer's memory, rather than loading from a hard disk drive. A Live CD allows users to run an operating system for any purpose without installing it or making any changes to the computer's configuration. You can also create a Live USB, which depending on the configuration and USB size may also allow saving data back to the USB (unlike a Live CD/DVD). ''