PLC is the mains plug adaptor for power Line Communications. Every time we have more and more devices using Internet connection at the same time. That's why PLC networks use electrical cables to transmit data, Internet or communication between devices in the home.
PLC's have a frequency filter to separate the digital information from the electrical signal. Digital information travels encrypted by the electrical signal used to power appliances. The electric current traveling at low frequency of 50 Hz and 220 volts. On the other hand we have the data signal that is at a higher frequency and with a lower voltage, which is separated by a filter.
The PLC uses the standard of the company HomePlug Powerline Alliance defined by the Universal powerline Association. Popularly known as HomePlug, regulations that we find in most PLC