power-line digital subscriber line (PDSL), mains communication, power-line telecommunications, or power-line networking (PLN).

Power line networking (PLN) uses existing electrical wiring, whether in a building or in the utility grid, as network cables, meaning they also carry data signals. It can be a means of extending an existing network into new places without adding new wires.

A PLC connection has many advantages over a wireless connection; however the quality of the connection will still depend on the quality of the domestic electrical system. Improper wiring and circuit breakers in between the connected cables can negatively affect the performance, and can cause connection interruptions.

                                                                                                                                                                                                                                  


                                                                                                                                                             ----- Adapted from Wiki