Chhath is one of the few Hindu festivals in which the Sun itself is worshipped directly, without an idol and usually without a priest. The person keeping the fast (called a vrati or parvaitin) stands in water and offers thanks to the Sun, the visible source of light, warmth, harvest and health. Honouring the setting Sun as well as the rising one is a reminder that every phase of life deserves gratitude.
The festival is known for its discipline and cleanliness. Homes, kitchens, utensils and ghats are cleaned, prasad is cooked separately on a fresh or earthen stove, and the main fast is kept without food or water for about a day and a half. Families often take the vow for the wellbeing of their children, for health, or in thanks for a wish that has been fulfilled.
Chhath is also deeply communal. Neighbours clean the ghats together, relatives travel home from distant cities, and the songs sung on the way to the water are passed down from one generation to the next. Rich and poor stand side by side in the same water with the same simple bamboo baskets of fruit.
Several traditions explain the origin of Chhath. One popular account says that after returning to Ayodhya, Sita and Rama fasted and worshipped the Sun on Kartika Shukla Shashthi. Another links it to the Mahabharata: Karna, the son of Surya, is said to have stood in water every day offering prayers to his father, and Draupadi is said to have worshipped the Sun with the Pandavas during their hardship.
Chhathi Maiya is widely identified with Shashthi Devi, a goddess who protects infants and young children, and in folk songs she is often described as the sister of the Sun. This is why many mothers keep the Chhath fast for the long life and health of their children, and why the festival's songs speak of her with such affection.