diwali & Significance in Hinduism

Significance in Hinduism

Diwali is also known as festival of lights. Shown here is the view of Jaipur city on Diwali day.

A Gurgaon office building decorated with lights.
The festival marks the victory of good over evil. The Sanskrit word Deepavali means an array of lights that stands for victory of brightness over darkness. As the knowledge of Sanskrit diminished, the name was popularly modified to Diwali, especially in northern India. In South India, Diwali does not coincide with the beginning of a new year as South Indians follow a different calendar, the Shalivahana calendar.
On the day of Diwali, many wear new clothes, share sweets and snacks. Some North Indian business communities start their financial year on Diwali and new account books are opened on this day.
Hindus find cause to celebrate this festival for different reasons:
It commemorates the killing of Narakasura, an evil demon who created havoc, by Lord Krishna's wife Satyabhama. This happened in the Dwapara Yuga during this time of Lord Krishna's avatar. In another version, the demon was killed by Lord Krishna himself. Before Narakasura's death, he requested a boon from his mother, Satyabhama (believed to be an Avatar of Bhudevi - Narakasura' mother), that everyone should celebrate his death with colorful light.
According to the Skanda Purana, the goddess Shakti observed 21 days of austerity starting from ashtami of shukla paksha (eighth day of the waxing period of moon) to get half of the body of Lord Shiva. This vrata (austerity) is known as kedhara vrata. Deepavali is the completion day of this austerity. This is the day Lord Shiva accepted Shakti into the left half of the form and appeared as Ardhanarishvara. The ardent devotees observe this 21 days vrata by making a kalasha with 21 threads on it and 21 types of offerings for 35 days. The final day is celebrated as kedhara gauri vrata.
Diwali also celebrates the return of Lord Rama, King of Ayodhya, with his wife Sita and brother Lakshmana to Ayodhya from a war in which he killed the demon king Ravana. It is believed that the people lit oil lamps along the way to light their path in the darkness. This is the reason, why the festival is celebrated a day earlier in South India since Lord Rama travelled from the south to his kingdom in the north. In North India, the festival is held on the final day of the Vikram calendar. The following day marks the beginning of the North Indian new year, and is called Annakut.
Govardhan Puja is celebrated the day after Diwali. It is the day Lord Krishna defeated Indra, the deity of thunder and rain. As per the story, Krishna saw huge preparations for the annual offering to Lord Indra and questions his father Nanda about it. Why was this necessary? Why should human beings offer anything to some unknown being in the sky? He debated with the villagers about what their 'dharma' truly was. They were farmers, they should do their duty and concentrate on farming and protection of their cattle. He continued to say that all human beings should merely do their 'karma', to the best of their ability and not pray for natural phenomenon. The villagers were convinced by Krishna, and did not proceed with the special puja (prayer). Indra was then angered, and flooded the village. Krishna then lifted Mt Govardhan and held it up as protection to his people and cattle from the rain. Indra finally accepted defeat and recognized Krishna as supreme. This aspect of Krishna's life is mostly glossed over - but it actually set up the basis of the 'karma' philosophy later detailed in the Bhagavat Gita.
In Bhavishyottara and Brahma Vaivarta Purana, Diwali is associated with the Daitya king Bali, who is allowed to return to earth once a year. However in Kerala this is the reason 'Onam' is celebrated. 'Onam' festival falls around the month of August-September.