Workstations vs. Servers vs. PC

To buy a personal computer, we know that there are desktops, business books, game books, but occasionally have seen workstations. If you are working in the enterprise also know that there are servers. What are the differences of workstations, servers…
PoE vs. PoE+ vs. UPoE (PoE++)

We know that some of small network devices can be powered by ethernet, that is, we say PoE. Now there are not only PoE and PoE+, but also UPoE. What are their differences? Power over Ethernet or PoE describes any…