Navaratri
Navaratri is a Hindu festival of worship and dance.
The word Navaratri literally means nine nights in Sanskrit, nava meaning nine and ratri meaning nights. During these nine nights and ten days, nine forms of Shakti/Devi are worshipped.
Nine forms of Shakti are worshipped during the Navaratris.
Web : http://en.wikipedia.org/wiki/Navratri