Looking at the UNO boards and was wondering what PoE but also what can ethernet do for your robot?
PoE means "Power over Ethernet". It uses some of the spare wires in the Cat-5 UTP cable to provide power to devices.
Using Ethernet on your robot means that you can have your robot connected to a network, with a cable. WiFi is more applicable to robots.
How do you use a network with an Arduino or wifi
jrmc114064:
How do you use a network with an Arduino or wifi
That's a really, really general question; the response to that could be a long as a book!
So here's a book: Making Things Talk [Book]