Navadurga (Devanagari:नवदुर्गा), which literally means nine Goddess Durgas, constitute, according to Hindu mythology, the manifestation of Durga in nine different forms. These nine forms of manifestation are Śhailaputrī, Brahmachāriṇī, Chandraghaṇṭā, Kuṣhmāṇḍā, Skandamātā, Kātyāyanī, Kālarātrī, Mahāgaurī and SiddhidātrīShree Jagadishvarananda, Svami (tr.) (1992) Shri Shri Candi (in Bengali), Kolkata: Udbodhan, Shri Ramkrishna Math, p.27; together worshipped during the Navratri (Nine Divine Nights) celebration in Autumn each year.
Read more about Navadurga: Forms of Manifestation, Meditative Mantra, NavaDurga Life Phases