What's so great about Knoppix?

I'm just wondering, because I keep hearing about it and I've read a little bit about it. From what I understand it's just an OS that runs off of a CD. A version of GNU/Linux, I guess.

So what makes it worthwhile? I mean, can you write data with it? Because it's on a CD...

Anyways, I'm a total newb when it comes to Linux and this Knoppix thing has been bugging me for a while.

WHAT MAKES IT SPECIAL!?

>>9
man mount is the command (run in Terminal) that gives you help about the mount(8) command.  The mount command will let you connect a hard drive to the filesystem and use it.

So you can write data with it, if you want.  LiveCD's usually make you do this manually for safety reasons.

The point of the Knoppix LiveCDs is to be able to boot and run Linux without needing to even touch the hard drives in the system.  This is special because you can have a fully functional OS that doesn't even touch anything currently installed on the hard drive (unless you tell it to).  Useful for:

- using computer without leaving trace of evidence
- recovering files from HD with crashed OS on it
- modifying files on HD that installed OS won't let you modify while it runs
- just trying out Linux safely with no need to undo anything