Hindus believe in one Supreme Being, Paramatma, revealed as Brahman, Ishwar and Bhagwan. Vishnu's avatars include Matsya (fish), Kurma (tortoise), Varaha (boar), Narasimha, Vamana, Parashurama, Rama, Krishna, Buddha and Kalki. Avatars descend to protect dharma. Devi (the Mother Goddess) appears as Durga, Lakshmi and Saraswati.