Daughter of demon Kalanemi, married with Jalandhara. Vrinda shared her mystical powers with her husband and Vishnu could only destroy him by intrigue. For this she cursed him to become a salagrama.
Vishnu promised the terrified Vrinda to be allowed to live in his kingdom and to grow on earth as the Tulsi plant, the plant that is sacred to him.
A similar story is Tulsi and Shankhachuda.