The Short Answer
Yes. A PoE-powered computer behaves as a Powered Device, taking its power from the same Ethernet cable that carries its data. That removes the need to run mains power and fit a local supply at the installation point, which is often the hard part of a deployment.
When It Makes Sense
It suits places where wiring is awkward or space is tight, a ceiling, a pole, a sealed cabinet or a kiosk, where one cable is far simpler than two. Our PoE computers include both PoE-powered (PD) models and models that act as the source (PSE) for cameras and sensors. The power budget of the PoE source has to cover the computer, so check the standard and wattage against the unit.
See our guide to industrial Power over Ethernet for the full picture.