What is ath and eth I managed to find out, but perhaps I will clarify. As I understand,

eth - ethernet interface is for cable,
ath - serves for wifi,

accordingly, if the router has several sockets (let's add 2), then it will have eth0 and eth1 interfaces. If not, then correct.

If ath is wifi, then what is wifi0 itself?

    1 answer 1

    Judging by this article, wifi0 is a physical interface, and ath0 refers to a virtual one . And, I dare to suggest, letter A at the beginning of the word Air or Atheros.