Starting Thursday, November 12, 2020, over a billion people worldwide will begin celebrating Diwali, the Festival of Lights. Also known as Deepavali, the ancient tradition, which dates back over 2,500 years, is observed by Indians of many faiths, including Hindus, Jains, Buddhists, and Sikhs. While the commemoration lasts five days, the most important day — the celebration's namesake — falls on the third day. This year, Diwali will be celebrated on Saturday, November 14, 2020.