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concept behind bootcamp is virtualisation
I don't believe that's true. BootCamp is a dual-boot solution, letting you start your computer using Mac OS X or Windows.
Parallels Desktop is a virtualization too, allowing you to run one or more copy of Windows (or other OSes, e.g., Linux) "in a window" on an Intel Mac. Thus, a second "virtual" computer runs on your physical machine.
A third approach is used by CrossOver and WINE, where software is installed that lets many but not all windows applications run on Mac OS X, without need for any Windows install.