Who was the first astronaut to walk on the moon?

The first astronaut to walk on the moon was Neil Armstrong, who made history on July 20, 1969, during NASA's Apollo 11 mission. When he descended from the lunar module and set foot on the lunar surface, he famously declared, "That's one small step for [a] man, one giant leap for mankind," marking a monumental moment in space exploration. Armstrong's role as the commander of Apollo 11 placed him at the forefront of this extraordinary achievement, which represented not just a personal accomplishment, but a significant milestone for human exploration and a testament to the capabilities of science and technology in the pursuit of space.