Neil Armstrong, born on August 5, 1930, was an American astronaut and test pilot, renowned for being the first human to walk on the moon on July 20, 1969. The U.S. and the Soviet Union were in a space race following World War II, with significant milestones like Yuri Gagarin becoming the first man in space in 1961, leading up to the successful Apollo 11 mission. Armstrong's famous quote while stepping onto the moon was 'that's one small step for man, one giant leap for mankind'.