Who said one small step for is one giant leap for mankind?

The phrase "That's one small step for [a] man, one giant leap for mankind" was famously said by astronaut Neil Armstrong when he became the first person to walk on the Moon on July 20, 1969, during NASA's Apollo 11 mission. The quote highlights the significance of the lunar landing for humanity's exploration and achievements in space. Armstrong's Words have since become iconic, symbolizing human ingenuity and exploration.