Neil Armstrong was an American astronaut and aeronautical engineer who became the first human to walk on the Moon during the NASA Apollo 11 mission. A former naval aviator and test pilot, Armstrong was known for his calm under pressure, a trait that proved vital when he had to manually pilot the Lunar Module 'Eagle' to avoid a boulder-strewn crater during the landing. Upon stepping onto the lunar surface, he uttered the historic phrase, 'That's one small step for [a] man, one giant leap for mankind.' His achievement represented the culmination of the Space Race and remains one of the most significant moments in human exploration. Armstrong remained a modest figure throughout his life, often crediting the hundreds of thousands of engineers and scientists who made the mission possible rather than focusing on his own fame.