Power line communication uses existing power lines to transmit data and provides a way to share internet access and create home networks without additional wiring. It allows devices to be plugged directly into power outlets for high-speed connectivity anywhere in the home. While wireless is good for mobile devices, powerline communication provides more reliable streaming, whole-home coverage, faster speeds, and greater security through encryption. It can be used to set up smart home systems, security monitoring, and internet phone service without running new cables.