Durga is worshipped in different forms. She is a form of "Shakti". The evolution of Shri Maha Saraswati, Shri Maha Laxmi and Shri Mahakali (the 3 main forms of "Shakti") took place from Shri Brahma, Shri Vishnu and Shri Mahesh respectively. Each of these 3 deities gave rise to 3 more forms and hence in all, these 9 forms together are known as Nav-Durga.
Goddess Durga has nine names as follows: shailputri, brahmcharini, chandraghanta, kushmanda, skandmata, katyaini, kaalratri, mahagauri, and siddhatri. In Navratri, worshiping all these forms of Goddess Durga is important. Navratri puja is started with the Kalash Sthapana. According to Hindu customs, Kalash is considered to represent Lord Ganesha, therefore the puja is started with chanting lord Ganesha's mantra. Thereafter, different forms of Goddess Durga is worshipped by these following mantras.
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