When Celebrated Vijay Dashmi or Dussehra is celebrated on tenth day of Hindu month of Ashwin.
Why Celebrated - Significance
This day marks the triumph of Shree Rama over Demon king Ravana, who abducted Sita, wife of Shree Rama and took to his kingdom of Lanka. After a long battle Shree Rama alongwith his brother Laxman and with the help of Hanuman and Sugreev, rescued Sita. Shree Rama made Vibhishan, the brother of Ravana, king of Lanka.
It is also believed that the Pandavas after long exile took their weapons (hidden in the Shami tree) to fight the Kauravas.
In Eastern India, People celebrate the victory of Goddess Durga over buffalo king Mahishasura. The five day long extravaganza starts on 6th day of Navratri and ends on Vijaya Dashmi. They offer Sindoor, sweets, betel leaves and prasad to the idol of Durga , and later distribute sweets amongst themselves.