Diwali is a major Hindu festival celebrated in India that symbolizes the victory of light over darkness and good over evil. It is celebrated by Hindus, Sikhs, and Jains through prayers, the lighting of lamps, fireworks, and the exchange of sweets and gifts. Diwali marks the return of Lord Rama to his kingdom Ayodhya after defeating the demon king Ravana and is seen as a celebration of the triumph of good over evil.