What's the meaning of "Parallel Operating System" and "Parallel Desktop"?

What's the meaning of "Parallel Operating System" and "Parallel Desktop"?
Also, what is Boot camp? Are they all the same?

Boot Camp installs Windows directly on your Mac so you reboot your system to switch between OS X (the "Mac" experience) and Windows if you need to use it for any reason.
The problem with boot camp is that you cannot use your Mac applications along with any that require Windows, so companies like Parallels have developed "virtualization" programs that allow you to install Microsoft Windows within OS X and run Windows inside of your Mac instead of "next" to it as is the case with Boot Camp. You open the program and boot a Windows installation that loads in a separate window, all while you have Safari, the OS X Finder, Mail, Calendar, and other programs on your Mac still running in the background.
In this regard, the benefit of Parallels Desktop and similar applications is that they allow you to run a Windows program alongside those for OS X so you do not interrupt your workflow in order to reboot to Windows and use them.

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