Eid (Arabic: “feast," "festival," "holiday") is a worldwide festival and celebration for Muslims. During the calendar year there are two Eid’s that are celebrated by Muslims. Eid ul Fitr, which means “festival to break the fast”, is at the end of the holy month of Ramadan in which Muslims fast for a whole month.
The second Eid is Eid ul Adha, which means “Festival of Sacrifice” and occurs two months after Eid ul Fitr in which Muslims sacrifice animals for the sake of Allah. The date of Eid al-Adha also varies in accordance with the Islamic lunar calendar, falling on the tenth day of Dhu al-Hijjah (the twelfth month). Eid ul Adha is known as the greater Eid and commemorates the willingness of the Prophet Abraham to sacrifice his son Ishmael as an act of obedience to Allah at which point Allah showed great mercy by switching a ram with Ishmael at the last moment of sacrifice. Muslims believe that the very moment Abraham raised the knife, Allah instructed him to stop, that Abraham had passed the test, and to replace Ishmael with a sacrificial ram.