Zil Hijjah is the last month of the Islaamic lunar calendar. The literal meaning of Zil Hijjah is 'the month of Hajj' (pilgrimage). The fifth pillar of Islaam - Hajj - is performed in this sacred month.
The tenth day of this blessed month is known as 'Eid-ul-Adh'haa (the festival of sacrifice) or yaum-un-nahr (the day of camel sacrifice). The Muslims all over rejoice and sacrifice animals for the pleasure of Allah with the intention of gaining His nearness, and commemorate the incomparable and unique act of obedience of Ibraaheem alayhis Salaam towards Allah who ordered him to sacrifice his only son who was the apple of his eye.