The V-1, also known as the "buzz bomb" or "doodlebug," was an early cruise missile developed by Nazi Germany during World War II. It was designed to carry an explosive payload and was launched from ground sites or aircraft. The V-1 was powered by a pulsejet engine, which produced a distinctive buzzing sound during flight, hence its nickname. The V-1 was first used in 1944 against targets in London and other cities, causing significant destruction and civilian casualties. It was part of the larger V-weapons program, which also included the more advanced V-2 rocket. The V-1's development marked a significant step in the evolution of guided missile technology.