PoE (Power over Ethernet) allows Ethernet networks to also carry power, allowing devices like IP cameras and wireless access points to receive power through Ethernet cables rather than requiring a separate power supply. The document discusses PoE, defining PSE (Power Sourcing Equipment) as devices that provide PoE power, such as PoE switches, and lists several PoE switch models from VERSITRON that are suitable for powering devices over an Ethernet network.