Not really sure what you're asking there.
Bootcamp creates a partition on your hard drive and allows you to install Windows into it. You then reboot your Mac, it doesn't load OS X at all but boots straight into this new partition and loads Windows natively. It's good, and it allows Windows full access to the hardware so there's no emulation like VMWare. As an example, my bootcamped Vista x64 gives me a flat performance score of 5.9 over everything which I doubt it would do via VMWare.
You can run a VM within OS X with Linux in it, you can bootcamp to Windows and run a VM within Windowx with Linux in it but I don't believe you can bootcamp to Linux.
Does that help?