[Text Source from Wikipedia]: Navarathri is a 10-days (nine nights) festival celebrated in India. Navarathri represents celebration of Goddess Durga, the manifestation of Deity in form of Shakti [Energy or Power]. Nine Forms of Shakti are worshipped during the Navarathris. In South-India, people set up steps (like a staircase) and place idols on them and this is known as golu.
Navarathri is divided into sets of three days to adore
Navarathri is divided into sets of three days to adore