Generally, naval ships are damage resilient and armed with weapon systems, though armament on troop transports is light or non-existent.
Naval ships designed primarily for naval warfare are termed warships, as opposed to support (auxiliary ships) or shipyard operations.
Naval ship classification is a field that has changed over time, and is not an area of wide international agreement, so this article uses the United States Navy general classifications.
[1] In rough order of tonnage (largest to smallest), modern surface naval ships are commonly divided into the following different classes.
Navies also use auxiliary ships for transport and other non-combat purposes.