The Second World War was a historical event that shook the world, and behind this conflict, there was the important role of technology that changed the way warfare was carried out. From weapons to communications, technology has become a crucial tool that influences the outcome of battles. One of the greatest innovations was the fighter aircraft. Countries such as the United States and Britain developed bomber aircraft, such as the B-17 and Lancaster, capable of carrying out strategic air strikes. This allows them to attack an opponent’s infrastructure more effectively. In addition, the development of radar helped improve enemy detection capabilities, increasing the threshold for victory in the air. On the land battlefield, tanks play an important role. Light and heavy tanks, such as the German Panzer and the US Sherman, provided superior mobility and firepower. The German Blitzkrieg tactics showed how a combination of tanks and infantry could destroy enemy defenses with incredible speed. Communication has also experienced significant developments. The use of radio makes communication between units faster and more efficient. This is an important factor in coordinating strategy and troop movements. Additionally, early computers were used for ballistic calculations and message coding, increasing efficiency in military operations. In the context of naval combat, submarines are a very impactful innovation. German U-boat type submarines implemented guerrilla warfare tactics at sea, sinking alliance underwater vessels with deadly speed and strategy. Aircraft carriers, with the ability to transport fighters to the battlefield, changed the dynamics of naval combat. Chemical compounds, such as poisonous gases, are also widely produced and used. Although controversial and dangerous, chemical technology changed the way warfare was fought, adding new dimensions to tactics and strategy. The role of information technology is increasingly felt through the development of encryption. The German Enigma machine represented advanced technology for its time, but was cracked by the Allies, providing crucial intelligence information. Wiretapping and the use of surveillance technology provide significant strategic advantages. Apart from that, innovation in the medical sector also plays an important role. Antibiotics, particularly penicillin, were discovered and widely used to save the lives of injured soldiers. Better medical technology helps speed recovery and maintain troop morale. All these developments show that without technology, the outcome of the Second World War might have been different. The ability to adapt and innovate is a determining factor that influences the course of conflict. As a fundamental discovery, technology in the Second World War not only became a tool of war, but also created long-term impacts that influenced the development of the military and world society afterwards.