Why is the David naked?

Michelangelo's David is depicted as nude to emphasize the idealized human form and showcase the beauty of the human body, reflecting Renaissance ideals of Humanism and anatomical precision. The nudity signifies both vulnerability and strength, representing the biblical hero David's courage and moral integrity in facing Goliath. Additionally, it allows viewers to appreciate the intricate details of Michelangelo's sculpting technique, highlighting his mastery of marble.