Why do astronauts have to ware protective suits when they are on the surface of the moon?

Astronauts wear protective suits on the moon primarily to shield themselves from extreme temperatures, harmful radiation, and micrometeorite impacts. The moon's lack of atmosphere means there's no air to breathe, so the suits provide a life-sustaining environment with oxygen. Additionally, the suits offer mobility and protection from lunar dust, which can be abrasive and pose health risks.