the tanks were important in the world war two. because they used to hit people in a very far distance. The doctrine of armored warfare changed radically in the inter-war years as armies sought ways to avoid the deadlock imposed by modern firepower and looked for the means to restore offensive power on the battlefield.tanks  were an important weapons system in world war 2. Although tanks were the subject of widespread research in the inter-war years, production was limited to relatively small numbers in a few countries. However, during World War II most armies employed tanks, and production levels reached thousands each month. Tank usage, doctrine and production varied widely among the combatant nations. By war's end, a consensus was emerging regarding tank doctrine and design.

The List of aircraft of World War II includes all the aircraft used by those countries which were at war during World War II from the period between their joining the conflict and the conflict ending for them. Aircraft developed but not used operationally in the war are in the prototypes section at the end. Prototypes for aircraft that entered service under a different design number are ignored in favor of the service version. The date the aircraft entered service, or was first flown if the service date is unknown or it did not enter service follows the name, followed by the country of origin and major wartime users. Aircraft used for multiple roles are generally only listed under their primary role unless specialized versions were built for other roles. Aircraft used by neutral countries such as Spain, Switzerland and Sweden or countries which did no significant fighting such as most of those in South America (except Brazil), are not included.

At the beginning of WWII the battleship was seen as the height of sea power and having the most powerful and fastest battleships was considered all important. This was the so-called big gun thinking dating from World War One.These ships of the line were still considered the central components of the navies of all world powers at the start of the war, but by the war's end, these floating fortresses found their roles dramatically changed at the face of air power.Around the time of World War One a new subclass of Battleships arrived; fast battleships. These were very fast and also very powerful, example being the famous German Biscmarck class. In 1938 USA, Britain and France invoked an escalator clause in the Second London Treaty to build battleships up to 45,000 tons.