Hajj is an annual Islamic pilgrimage to Mecca, Saudi Arabia, the holiest city for Muslims. Hajj is a mandatory religious duty for Muslims that must be carried out at least once in their lifetime by all adult Muslims who are physically and financially capable of undertaking the journey, and of supporting their family during their absence from home. In Islamic terminology, Hajj is a pilgrimage made to the Kaaba, the "House of Allah," in the sacred city of Mecca in Saudi Arabia.