They are smallest ship class in World of Warships Blitz. They are also known as DD in short. Speed and Maneuverability are their main characteristics, but their weaknesses are their light armour and short quantity of main guns.
Destroyers are best used in a hit and run stratergy, where they excel with their high damaging torpedoes and excellent maneuverability. Their speed also allows them to intercept other destroyers and to bolster anti-air defenses in a different sector.
A good destroyer commander has to know that destroyers are outgunned at very long range and outarmored, and they have to make up with speed, maneuverability and with their powerful torpedoes.