The story of Diwali:
Northern India – Diwali marks the story of King Rama’s return to Ayodhya after he defeated Ravana by lighting rows of clay lamps.
Southern Indian – Diwali marks the day when Lord Krishna defeated the demon Narakasura.
Western India – the festival marks the day when Lord Vishu sent the demon King Bali to rule the underworld.
In Jainism, Diwali marks the nirvana or spiritual awakening of Lord Mahavira.
For Sikhs, Diwali marks the day when Guru Hargobind was freed from imprisonment.