Karachi is the largest city of Pakistan and a comparatively young Islamic metropolis whose religious significance comes less from medieval monuments than from its role as the home of one of the largest concentrated Muslim populations on earth and the chief port of the Muslim-majority Pakistani state. The Mausoleum of Muhammad Ali Jinnah, founder of Pakistan, stands at the center of the city as a national focal point, and historic mosques such as the Memon Masjid in the older quarters anchor a dense urban Friday-prayer culture. Karachi hosts major Deobandi and Barelwi madrasa networks, including the influential Darul Uloom Karachi associated with the Usmani family, and the city is a leading center of Islamic banking, contemporary fatwa publication, and Urdu Islamic media. Sufi shrines such as Abdullah Shah Ghazi continue to draw significant ziyarah, and Ramadan in Karachi is marked by intense civic and commercial activity around iftar and tarawih across its vast neighborhoods.