Excerpt:

Diwali holds profound cultural and spiritual importance in India. Celebrated with exuberance, this five-day festival culminates in major festivities on its third day, symbolising the conquest of light over darkness and good over evil. During Diwali, homes and streets come alive with vibrant rangoli, intricate designs made from colored powders or flower petals.

See also: https://www.cnn.com/travel/diwali-festival-of-lights-explained-cec/index.html