 It marks the victory of ten-armed goddess Durga over the buffalo demon Mahishashur and signifies the victory of good over evil.The festival commences on Mahalaya, a week before the actual Puja celebrations begin on "Sashthi" and continue through "Saptami", "Ashtami", "Navami" and "Bijaya Dashami", when the festival comes to an end.Pandals are set up and idols of goddess Durga and her four children - Lakshmi, Saraswati, Kartik, Ganesh are worshipped and displayed for five days across the state, especially in Kolkata.