Diwali is a religious occasion where the emphasis is heavily on lighting. Using light (such as candles and clay lamps) stands for optimism over despair or brightness over darkness.
Diwali marks the day Lord Rama, his wife Sita Devi, and his brother Lakshmana return to their home country after 14 years of exile in one of the major Hindu myths.
The locals lighted a route for Rama after he vanquished Ravana, the demon king. Celebrations in various areas include re-enactments of this tale.
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