Karachi is the provincial capital of Sindh province and the largest city in Pakistan. It is also one of the largest cities in the world. It was the original capital of Pakistan and remains the cultural and economic hub, as well as being the largest seaport of the country. Its leading economic sectors include finance, business services, transportation, media, television production, publishing, software, medical research, education and tourism.
Spread over 3,530 square kilometres (1,363 sq mi), the city and suburbs comprise the world's twentieth largest metropolitan area. The city credits its growth to the mixed populations of economic and political migrants and refugees from different national, provincial, linguistic and religious origins who have largely come to settle here permanently. It is locally termed as the "City of Lights" for its liveliness and the "City of the Quaid", having been the birth and burial place of Quaid-e-Azam Muhammad Ali Jinnah, the founder of Pakistan, as well as his home after 1947. Residents of Karachi are called "Karachiites".