Eid al-Adha also called the "Festival of Sacrifice", is the second of two Islamic holidays celebrated worldwide each year (the other being Eid al-Fitr), and considered the holier of the two.
It honors the willingness of Ibrahim (Abraham) to sacrifice his son as an act of obedience to God’s command. Before Abraham sacrificed his son, God provided a male goat to sacrifice instead.
In commemoration of this, an animal is sacrificed and divided into three parts: one third of the share is given to the poor and needy; another third is given to relatives, friends and neighbors; and the remaining third is retained by the family.
In the Islamic lunar calendar, Eid al-Adha falls on the 10th day of Dhu al-Hijjah.
In the international (Gregorian) calendar, the dates vary from year to year drifting approximately 11 days earlier each year. Eid al-Adha is the latter of the two Eid holidays, the former being Eid al-Fitr.