Sita is considered the avatar of Goddess Lakshmi, who is Vishnu's divine consort and the goddess of wealth, fortune, and prosperity. Just as Rama is Vishnu's avatar, Sita is Lakshmi's incarnation on earth, maintaining their divine partnership across lifetimes. Durga and Kali are powerful goddesses in their own right, while Krishna is another avatar of Vishnu himself, not a spouse.