Navdurga which means Nine Durga is the manifestation of Durga in nine different forms. The concept of Navdurga originates from Goddess Parvati. Conceptually Navdurga is the life phase of Goddess Parvati who is considered supreme power among all Goddesses. Navdurga are worshipped during all Four Navrati in the year.
Devi Siddhidatri - In the beginning of the universe Lord Rudra worshipped Adi-Parashakti for creation. It is believed that Goddess Adi-Parashakti had no form. The supreme Goddess of Power, Adi-Parashakti, appeared in the form of Siddhidatri from the left half of Lord Shiva.
Devi Kushmanda - After taking form of Siddhidatri, Goddess Parvati started living inside the center of the Sun so that He can liberate energy to the universe. Since then Goddess is known as Kushmanda. Kushmanda is the Goddess who has the power and capability to live inside the Sun. The glow and radiance of her body is as luminous as that of the Sun.
Devi Brahmacharini - After Kushmanda form, Goddess Parvati took birth at the home of Daksha Prajapati. In this form the Goddess Parvati was a great Sati and her unmarried form is worshipped as Goddess Brahmacharini.
Devi Shailputri - After the self-immolation as Goddess Sati, Goddess Parvati took birth as the daughter of Lord Himalaya. In Sanskrit Shail means the mountain and due to which Goddess was known as Shailputri, the daughter of the mountain.
Devi Mahagauri - According to Hindu mythologies, the Goddess Shailputri at the age of sixteen was extremely beautiful and was blessed with fair complexion. Due to her extreme fair complexion she was known as Goddess Mahagauri.
Devi Chandraghanta - Goddess Chandraghanta is the married form the Goddess Parvati. After getting married to Lord Shiva Goddess Mahagauri started adorning her forehead with half Chandra and due to which she was known as Goddess Chandraghanta.
Devi Skandamata - When Goddess became the mother of Lord Skanda (also known as Lord Kartikeya), Mata Parvati was known with the name of Goddess Skandamata.
Devi Katyayani - To destroy demon Mahishasura, Goddess Parvati took the form of Goddess Katyayani. It was the most violent form of Goddess Parvati. In this form Goddess Parvati is also known as Warrior Goddess.
Devi Kalaratri - When the Goddess Parvati removed outer golden skin to kill demons named Shumbha and Nishumbha, She was known as Goddess Kalaratri. Kalaratri is the fiercest and the most ferocious form of Goddess Parvati.