Power over Ethernet (PoE) is a technology that allows electrical power to be transmitted along with data over standard Ethernet cables. This means that devices such as wireless access points, IP cameras, VoIP phones, and other networked devices can be powered using the same Ethernet cable that connects them to the network.

PoE works by injecting power into the Ethernet cable alongside the data signals. This eliminates the need for separate power cables and outlets for these devices, simplifying installation and reducing costs. PoE also allows for greater flexibility in device placement since they are not limited by the proximity to power outlets.

A PoE switch is a network switch that has the capability to provide power to PoE-enabled devices. These switches have built-in PoE functionality, allowing them to supply power to connected devices over Ethernet cables. PoE switches come in various configurations, with different numbers of PoE ports and power budgets to support a varying number of powered devices. They are commonly used in offices, schools, and other environments where there is a need for powering multiple networked devices without the hassle of additional power cables.