PoE (Power over Ethernet) allows both data and electrical power to be delivered over the same Ethernet cable. A PoE injector adds power to Ethernet cables for devices that need it.
From CompTIA A+ 220-1101 Official Study Guide, Objective 2.2 – Networking hardware:
“Power over Ethernet (PoE) technology and PoE injectors enable both power and data transmission to compatible network devices like access points and IP cameras.”
Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 2: Network Hardware
CompTIA Exam Objectives 220-1101, Domain 2.2
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