Durga Puja has grown synonymous with pandal hopping, spending time with friends & family and making merry. Durga Puja celebrations--observed in Bengal, Odisha, Assam, Tripura and Jharkhand--coincide with that of Shardiya Navratri. First significant day of Puja is Mahalya. Following Mahalya, the next important days begin from Shashti—the sixth day and concludes on the 10th day often referred to as Vijaya Dashami. Colloquially called Pujo, the festivities conclude with dhanuchi naach, sindoor khela on Vijaya Dashami before the idols are immersed. 

Pujo is observed to pay homage to Goddess Durga after her win over demon king Mahishasura. After nine days of fierce battle, Goddess Durga managed to kill the shape-shifting demon. The festival, thus, epitomises the victory of good over evil.