Final answer:
The hajj is a mandatory pilgrimage for Muslims to Mecca, involving specific rituals at sacred sites like the Ka'aba.
Explanation:
The hajj is a holy pilgrimage to Mecca, the birthplace of the Prophet Muhammad, that Muslims are required to undertake at least once in their lifetime if physically and financially able. During the hajj, pilgrims perform various rituals, such as circling the Ka'aba, praying, and symbolic stoning of the devil.
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