Network and addresses
Unmetered traffic
Transferred data is not billed — the bill does not grow however busy the server is.
Traffic is the amount of data the server sends and receives per month. Some plans cap it (say, 3 TB) and bill the excess. Unmetered means no extra charges.
“Unmetered” is usually limited by port speed and sometimes by a fair use policy. A site will hardly reach a few terabytes, but for file serving and VPNs unmetered matters.