What is Diwali, the Festival of Lights, and how is it celebrated?

Summary
Diwali, India’s most important festival, is celebrated by more than a billion people, including Hindus, Sikhs, Jains and Buddhists
Description from ABC News (US).
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What is Diwali, the Festival of Lights, and how is it celebrated?
Diwali, India’s most important festival, is celebrated by more than a billion people, including Hindus, Sikhs, Jains and Buddhists
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