Karachi (Urdu: کراچی; Sindhi: ڪراچي) is the largest city, main seaport and the main financial centre of Pakistan, and the capital of the province of Sindh. With an estimated population between 13 million and 15 million, Karachi is one of the world's largest cities in terms of population, the 13th largest urban agglomeration and the 4th largest metropolitan area in the world. It is Pakistan's premier centre of banking, industry, and trade and is home to Pakistan's largest corporations, including those involved in textiles, shipping, automotive industry, entertainment, the arts, fashion, advertising, publishing, software development and medical research. The city is a major hub of higher education in South Asia and the wider Islamic world.
It was the original capital of Pakistan until the construction of Islamabad and is the location of the Port of Karachi and Port Bin Qasim, two of the region's largest and busiest ports. After the independence of Pakistan, the city population increased dramatically when hundreds of thousands of Urdu-speaking migrants or Muhajirs from India, East Pakistan (later Bangladesh) and other parts of South Asia came to settle in Karachi.
The city is spread over 3,527 km2 (1,362 sq mi) in area, almost four times bigger than Hong Kong. It is locally known as the "City of Lights" (روشنیوں کا شہر) and "The bride of the cities" (عروس البلاد) for its liveliness, and the "City of the Quaid" (شہرِ قائد), having been the birth and burial place of Quaid-e-Azam (Muhammad Ali Jinnah), the founder of Pakistan, who made the city his home after Pakistan's independence.