There are four different ship classes in World of Warships Blitz and each has their strengths and weaknesses
Aircraft Carriers
This class becomes available when you reach tier 4 and only the USA and Japan has these huge ships. Both nations aircraft carriers have different special abilities and each carries three different types of planes with a unique role. These are Torpedo bombers, Dive bombers, and Fighters.
Battleships
These well armoured ships are considerably larger than cruisers and destroyers and come equipped with powerful main battery guns that are capable of inflicting massive damage. From tier 6 onwards, many battleships will come equipped with powerful self-defense AA guns which are capable of shooting down planes. Although possessing devestating firepower they aslo have their disadvantages, Battleships are slow to reload and also have poor concealment and low mobility compared to cruisers and destroyers which makes them vulnerable to torpedoes and focus fire from multiple ships.
Cruisers
Cruisers are basically support ships that give cover fire to destroyers, they are particularly effective at deailing with enemy aviation with their AA guns. Each countries cruisers are unique in their role which can range from long range sniping to stealth.
Destroyers
These ships are fast, maneuverable and able to strike an enemy with the use of its torpedo launchers as its main armament. Destroyers though are weak in armour and their primary guns are small in calibre.