But Diwali is perhaps best known as a festival of lights. Derived from the Sanskrit dipavali, which means “row of lights,” Diwali is known for the brightly burning clay lamps that celebrants line up outside their homes. (See dazzling pictures of Diwali, the festival of lights.)
The dates of this festival are based on the Hindu lunar calendar, which marks each month by the time it takes the moon to orbit Earth. Diwali begins just before the arrival of a new moon between the Hindu months of Asvina and Kartika—which typically falls in October or November of the Gregorian calendar. In 2020, Diwali begins on November 12, and its most important festival day will take place on November 14.
The meaning of Diwali—and its many legends
Diwali is so widely celebrated—it’s an important religious festival for Hindus, but is also observed among Jains, Sikhs, and Buddhists—that it has no single origin story. But while each religion has its own historical narrative behind the holiday, they all ultimately represent the victory of good over evil.