give a 'demo' session on a machine before installing or upgrading.This does go against many reasons for using a LiveCd session (rather than an installation) but it can be useful for multi-user machines, such as offices or in third world education projects. You can use a persistent image to keep data & settings safe after shut-down. Cd-drives & Dvd-drives are physically slower than hard drives. Although a LiveCD session is a good way to demo Ubuntu without making changes to a machine, a LiveCD will always be slower than a proper installation to the hard-drive. Ubuntu tries to make their LiveCD the easiest to use. It is rare to find a distro that has no LiveCd session at all. Most distributions (versions or "distros" of Linux) have this LiveCd functionality on their installer CD, a few have a separate Cd to download. However, Lubuntu, Xubuntu, Kubuntu and even unofficial Ubuntu-based distros as well as other versions all tend to have similar screens & menus. This guide has screen-shots of the 8.04 and 10.04 Desktop Edition of Ubuntu. A LiveCD usually finds your wired internet connection and Firefox should be able to surf the internet into here. A "LiveCD" is more than that because it gives the option of running a normal desktop environment with all the normal programs and some extras.
Windows users might be familiar with the term 'boot CD' or 'bootable CD' or 'Recovery/Restore Media'. Only some of the non-standard downloads (such as the "Alternate Cd") lack this functionality. Live mode is the default option when booting from CD. The standard Ubuntu Cd can be used as a LiveCd as well as an installer. Try Ubuntu without any changes to your machine! Windows or whatever you use normally is unaffected after trying this and then rebooting.
A live CD can be used for a quick demo or test of Ubuntu.
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