Vat Savitri Vrat is a Hindu festival which is a special festival for married women. This festival is also called Vat Purnima. This festival is celebrated by married women. In this festival, the married woman makes a symbol of her love for her husband by tying a ceremonial thread around a banyan tree. The festival is based on the story of Savitri and Satyavan. As described in the Mahabharata, this fast has become a symbol of idealistic femininity in Indian culture.
There is a lot of disagreement about this fast, according to Skanda Purana and Bhavishya Purana, it is a law to observe the full moon day of Shukla Paksha of Jyeshtha month, while according to Nirnayamrita etc. it is said that fasting on the new moon day of Jyeshtha month.
Even after differences in dates, the purpose of this fast is the same. Many women believe in observing this fast from Trayodashi of Jyeshtha month to Amavasya and likewise from Trayodashi to Poornima of Shukla Paksha. Most of those who worship Lord Vishnu do this fast on full moon.
In Vat Savitri fast, both 'Vat' and 'Savitri' have been considered to be of specific importance. Vat means tree to the banyan. Banyan tree is considered to be of special importance in Hinduism. It is clarified in the Puranas that Brahma, Vishnu and Mahesh reside in the vat. Savitri is considered a historical character in Indian culture. Savitri also means Ved Mata Gayatri and Saraswati.