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RHEL is Redhat Enterprise Linux
RHEL6 is version 6
RHEL7 is version 7
New version have updated packages as well new packages and also they are newest version to get support for long time. Old version is supported for sometime only.
As a user, you might not notice that much. As an admin, well, it's now got systemd instead of its old init system. I don't remember if later versions of RHEL6 already started renaming ethernet devices are not, but if not, they will give your ethernet devices different names. The default, instead of iptables is firewalld. Those are the big differences that come to mind.
firewalld is just a front end for iptables. Uninstall or disable firewalld and you're back to the old interface. If you don't stop firewalld, you will find that your rules will keep getting overwritten.
The big difference to the user is Gnome 3. If you like Windows 8, you'll like Gnome 3, or you could elect to use one of the alternative window managers such as KDE or Xfce.
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