Diwali (Deepavali) is the Hindu festival of lights, with variations celebrated in other Indian religions. It symbolises the spiritual "victory of light over darkness, good over evil, and knowledge over ignorance".
In the eastern and northeastern states of India, Durga Puja is synonymous with Navaratri, wherein goddess Durga battles and emerges victorious over the buffalo demon Mahishasura to help restore dharma.