Diwali or Dīpāvali (Sanskrit: दीपावलि: a row of lamps) is a significant festival in Hinduism, Buddhism, Sikhism, and Jainism, and an official holiday in India and Nepal.Adherents of these religions celebrate Diwali as the Festival of Lights. They light diyas—cotton string wicks inserted in small clay pots filled with oil—to signify victory of good over the evil within an individual.
In Hinduism, across many parts of India and Nepal, In the age of Sri Lord Krishna, named Naraka more powerful evil killed by Satyabhama who is wife of Sri Lord krishna,People celebrate the death of Naraka which is called as Diwali. Addition of the above story it is the homecoming of Rama after a 14-year exile in the forest and his victory over Ravana. In the legend, the people of Ayodhya (the capital of his kingdom) welcomed Rama by lighting rows (avali) of lamps (dĭpa), thus its name: dīpāwali. In South India, it marks the victory of Krishna over Narakasura.