The eleventh day of two fortnights of the waxing and waning Moon, in the lunar month, is known as Ekadashi in Sanskrit. The Bhagwat Geeta describes Ekadashi as the day when Lord Krishna explained the significance of fasting on this auspicious day to Arjuna.
Fasting during Ekadashi is for spiritual cleansing. It is dedicated to Lord Vishnu, the realm's protector lord. According to Hindu religion, the lunar phase has two different phases: the Krishna Paksha (new moon) and the Shukla Paksha (full moon) (waxing moon). Every phase lasts 14 days.