Eid ul-Adha (Id ul-Adha) is a four-day Islamic festival starting on the 10th day of the month of Dhul Hijja (Thou al-Hijja). Eid al-Adha is an Islamic festival to commemorate the willingness of Ibrahim (also known as Abraham) to follow Allah's (God's) command to sacrifice his son Ismael. Muslims around the world observe this event. Eid-ul-Adha ('festival of Sacrifice'), also known as the Greater Eid, is the second most important festival in the Muslim calendar. The festival remembers the prophet Ibrahim's willingness to sacrifice his son when God ordered him to. The devil tempted Ibrahim by saying he should disobey Allah and spare his son. As Ibrahim was about to kill his son, Allah stopped him and gave him a lamb to sacrifice instead.

Eid ul Adha is a public holiday in Muslim countries. Today Muslims all over the world who can afford it, sacrifice a sheep (sometimes a goat) as a reminder of Ibrahim's obedience to Allah. I They share out the meat among family, friends and the poor, who each get a third share. Eid usually starts with Muslims going to the Mosque for prayers, dressed in their best clothes, and thanking Allah for all the blessings they have received. At Eid it is obligatory to give a set amount of money to charity to be used to help poor people buy new clothes and food so they too can celebrate.

Islam celebrates two great festivals annually - Eid-ul-Fitr and Eid-ul-Adha. The first is the great festival that follows the month of Ramadan when the fast is broken. The second occurs about two months later during the month of Zil-Hajj when an animal is sacrificed in commemoration of Abraham's sacrifice of his son. This festival is incorporated in the great pilgrimage to Mecca which should properly be made during this month but it is also observed all over the Muslim world at the same time. The underlying importance of this festival is the spirit of sacrifice (qurbani) in memory of Abraham's great act of faith many centuries ago. Eid-ul-Adha is, according to Islamic teaching, a time for Muslims to learn the value of self-denial by making a sacrifice of something living to God. It is stringently denied by most Muslim theologians that the sacrifice has any further significance and it is especially denied that religious sacrifice has any atoning or propitiatory value. Abraham's great act of submission is thus regarded solely as an example of genuine surrender to the will of God and is to be followed as such.