"That's one small step for [a] man, one giant leap for mankind"

This famous quote was spoken by astronaut Neil Armstrong when he became the first person to walk on the moon in 1969. It signifies that while the physical action of stepping onto the moon was small for an individual (Armstrong himself), it represented a monumental achievement for humanity as a whole. The phrase highlights how a single person's effort can symbolize a collective human advancement, marking a significant milestone in exploration, science, and technology that benefits all of mankind.