Final answer:
Mecca is the main city central to the Islamic faith, considered the holiest city in Islam and the birthplace of the Prophet Muhammad. The annual pilgrimage to Mecca, the Hajj, is a significant practice for Muslims.
Step-by-step explanation:
The main city central to the Islamic faith is Mecca, located in Saudi Arabia. Mecca is considered the holiest city in Islam and is the birthplace of the Prophet Muhammad. Every year, millions of Muslims make a pilgrimage to Mecca, known as the Hajj, which is one of the Five Pillars of Islam.
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