The term "Little Boy" refers to the atomic bomb dropped on the city of Hiroshima, Japan, on August 6, 1945, during World War II. It was the first nuclear weapon used in warfare and was developed as part of the Manhattan Project. The bomb was a uranium-based weapon and had a significant impact on the course of the war. "Little Boy" exploded with a force equivalent to approximately 15 kilotons of TNT, causing widespread destruction and loss of life. The bombing resulted in the deaths of an estimated 140,000 people by the end of 1945, with many more suffering from injuries and radiation exposure in the years that followed.