Karwa Chauth (Hindi: करवा चौथ) is a one-day festival celebrated by Hindu women in North India in which married women fast from sunrise to moonrise for the safety and longevity of their husbands. The fast is traditionally celebrated in the states of Madhya Pradesh, Rajasthan, parts of Uttar Pradesh, Himachal Pradesh, Haryana, and Punjab. The festival falls on the fourth day after the full moon, in the Hindu lunisolar calendar month of Kartik. Sometimes, unmarried women join the fast for their fiancés or desired husbands.
This year (in 2016), the festival of Karwachauth will be celebrated on October 19th.
Ther is a similar festival known as Chhat is observed in Chhattisgarh, Madhya Pradesh, Jharkhand and western Bihar. In Sindh, Teej is celebrated in the same style.