faster backups, or "everybody wants to go to heaven, nobody wants to die"

1. The significance of group "nobody" or user "nobody"

Hi,
    I have seen the use of user "nobody" in /etc/passwd
and group "nobody" in /etc/group.
    Also there is "wheel", "sync" "operator".

    What is the significance of these and other named group / users?

                                                                Thanks
                                                                    Mike

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