Uzume, also called Ame-no-Uzume-no-mikoto or simple Ame-no-Uzume, is the goddess of dance, joy, good health and dawn. Her brother is Ninigi and is married to Saruta-Hiko.
It was Uzume who got the sun goddess Amaterasu out of the cave with her dancing, where she exposed her breasts and played with her genitals. It was this dance that caused the other deities to laugh, causing Amaterasu to become curious and to investigate.
Uzume also accompanied Ninigi to earth when Ninigi was to be the first emperor of Japan. It was a monster that appeared when Ninigi was about to descend that caused Uzume to approach this monster bare breasted and with a laugh. Uzume asked who this monster was, the answer was Saruta-Hiko, the god who later became Uzume’s husband.