The buffalo demon Mahishasura could not be defeated by any god. The gods combined their powers into one goddess, Durga, who fought him for nine nights and killed him on the tenth day, Vijayadashami.
Each region tells it in its own way. Bengal welcomes Durga home for Durga Puja, Gujarat dances garba around her lamp, and Mysuru celebrates Dasara as the victory of Goddess Chamundeshwari over Mahishasura, with the palace lit by nearly a hundred thousand bulbs.
On Vijayadashami Rama also defeated Ravana, and across North and Central India the Ramlila ends with effigies of Ravana being burned.
How families celebrateNine nights honour the Goddess in her many forms. South Indian homes set up a doll display on steps (golu in Tamil Nadu, bommala koluvu in Andhra, bombe habba in Karnataka), Gujarat dances garba and dandiya, Bengal celebrates Durga Puja, and the north stages the Ramlila. Saraswati is worshipped with books and instruments, Ayudha Puja honours tools and vehicles, and Vijayadashami is a lucky day to begin learning.
Golu doll display, garba nights, evening arati and sundal for visitors, Saraswati Puja (books rest for a day), Ayudha Puja (8 Oct) and Vijayadashami (9 Oct).