Diwali

Diwali, also spelled Divali, one of the major religious festivals in Hinduism, Jainism, and Sikhism, lasting for five days from the 13th day of the dark half of the lunar month Ashvina to the second day of the light half of the lunar month Karttika. (The corresponding dates in the Gregorian calendar usually fall in late October and November.) The name is derived from the Sanskrit term dipavali, meaning “row of lights.” The festival generally symbolizes the victory of light over darkness.

Encyclopaedia Britannica