The primary purpose of the Diwali festival in Hindu culture is to celebrate the victory of light over darkness and good over evil. Known as the Festival of Lights, it involves rituals, prayers, and festivities that honor the return of Lord Rama to Ayodhya after his exile. Families light oil lamps, burst fireworks, and share sweets to symbolize joy and prosperity. Diwali also signifies the start of a new year in some regions, promoting family unity and spiritual reflection.