Nava Durga: The Nine Appellations, Durga Puja, Mahalaya, Puspanjali, Dipawali, Kalipuja, Festival,Durga Puja Festival : Durgapuja : Durga Puja

Nava – that also means 'new' – denotes 'nine' the number to which sages attach special significance. Hence, we have Nava-ratri (9 nights), Nava-patrika (9 leaves / herbs / plants), Nava-graha (9 planets), and Nava-Durga (9 appelletions).

Here're the 9 manifestations of Goddess Durga. Each goddess has a different form and a special significance. Nava Durga, if worshipped with religious fervor, it is believed, lift the divine spirit in us and fill us with renewed happiness.

SKONDAMATA	KUSUMANDA	SHAILAPUTRI
She is the Goddess of Fire. She has four arms and three eyes. She rides a lion.	Seated on a lion, she has a magnanimous presence, and possesses eight arms. Her abode is the Solar region.	The embodiment of the power of Brahma, Vishnu and Shiva, she rides a bull and carries a trident and a lotus in her two hands.
KAALRATRI	BRAHMACHARINI	MAHA GAURI
This four-armed form rides an ass. She dissipates darkness from amidst her devotees, and bestows freedom from fear and adversity.	She is the one who practices devout austerity. Filled with bliss and happiness, she is the way to emancipation - Moksha.	She is like an eight-year-old girl. She is intelligent and peaceful, possesses three eyes and four arms, and uses the bull as her vehicle.
KATYAYANI	CHANDRAGHANTA	SIDDHIDATRI
The chosen goddess of Vrindavan, she is alluring in her golden form. She has four arms and three eyes, she is seated on a lion.	She is the apostle of bravery; she rides a lion, and has ten arms. She drives away all evildoers and demoniac incarnation.	The bestower of accomplishments, this manifestation is worshipped as one blessed with glory. Seated on a lotus, she has four arms.

http://hinduism.about.com/library/weekly/extra/bl-durga.htm

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Durga Puja is one of the most important festivel of Bengalies. The festivel goes on for five days. People play dhak, dhunuchi and shiuli on that occasion. The occasion starts from Mahalaya day, the day durga was assigned the task of eliminating evil