Final answer:
The Manhattan Project was a top-secret research and development project during World War II to develop the atomic bomb.
Step-by-step explanation:
The Manhattan Project was the code name for the development of the atomic bomb during World War II. It was a top-secret research and development project that took place from 1939 to 1946. The project involved scientists, engineers, and military personnel who worked together to create the first atomic weapons.
Learn more about Manhattan Project