Powerline communication uses adapters to transmit network signals over existing electrical wiring, avoiding the need for new CAT6 cables and offering a hardwired internet connection in hard-to-reach areas where running Ethernet is difficult or impossible (or where the house owner simply is too lazy).

Not POE, the opposite. Ethernet over power, powerline?

They were called homeplug at 1 point

I think they mean powerline adapters