'Umrah is a variant of Islamic pilgrimage called the Hajj. The Hajj is of two types: 1. The greater Hajj (Arabic: al-hajj al-akbar) and 2. the lesser Hajj which in Arabic is called 'Umrah. The greater Hajj is performed in the 12th month of Arabic calendar called Dhu-al-Hijjah while the 'Umrah can be performed anytime of the year. The greater Hajj is mandatory for every Muslim if he/she can endure it physically and afford it monetarily.