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The virbr0, or "Virtual Bridge 0" interface is used for NAT (Network Address Translation). It is provided by the libvirt library, and virtual environments (like Gnome Boxes or Virtualbox) sometimes use it to connect to the outside network (depending what network adapter you choose for the guest environment).

It was likely set-up with a VM software you installed at some point. If you'd like to remove it, and you're sure nothing else depends on it, you can use the following command:

sudo brctl delbr virbr0