Power over Ethernet (PoE) technology allows electrical power and data to be transmitted over standard Ethernet cables, simplifying installations for devices like wireless access points and security cameras. The article outlines the differences between PoE standards, the functionality of power sourcing equipment (PSE) and powered devices (PD), and provides practical insights for engineers and DIY enthusiasts looking to implement PoE solutions. It also highlights various integrated circuits (ICs) that facilitate PoE applications.