Neil Armstrong was the first person to step on the Moon. He made this historic achievement on July 20, 1969, during NASA's Apollo 11 mission. As the commander of the mission, Armstrong famously proclaimed, "That's one small step for [a] man, one giant leap for mankind," as he planted his foot on the lunar surface. His companion, Edwin "Buzz" Aldrin, followed him shortly after. The Apollo 11 mission marked a significant milestone in human exploration, demonstrating the capabilities of space travel and advancing scientific understanding of the Moon and the broader universe.