Karachi is the most populous city in Pakistan and 12th most populous city in the world, with a population of over 20 million. It is situated at the southern tip of the country along the Arabian Sea coast. It is the former capital of Pakistan and capital of the province of Sindh. Ranked as a beta-global city, it is Pakistan's premier industrial and financial centre, with an estimated GDP of over $200 billion (PPP) as of 2021. Karachi paid $9billion (25% of whole country) as tax during fiscal year July 2021 to May 2022 according to FBR report. Karachi is Pakistan's most cosmopolitan city, linguistically, ethnically, and religiously diverse,[24] as well as one of Pakistan's most secular and socially liberal cities. Karachi serves as a transport hub, and contains Pakistan’s two largest seaports, the Port of Karachi and Port Qasim, as well as Pakistan's busiest airport, Jinnah International Airport. Karachi is also a media center, home to news channels, film and fashion industry of Pakistan. Most of Pakistan's multinational companies and banks have their headquarters in Karachi. Karachi is also a tourism hub due to its scenic beaches, historic buildings and shopping malls.
The region has been inhabited for millennia, but the city was formally founded as the fortified village of Kolachi as recently as 1729. The settlement greatly increased in importance on arrival of the East India Company in the mid-19th century. British administrators embarked on substantial projects to transform the city into a major seaport, and connect it with the extensive railway network of the Indian subcontinent. At the time of the partition of India in 1947, the city was the largest in Sindh with an estimated population of 400,000 people.[24] Following the independence of Pakistan, the city experienced a dramatic shift in population and demography with the arrival of hundreds of thousands of Muhajir (Urdu-speaking people) Muslim refugees from India, coupled with a substantial exodus of its Hindu residents, whose numbers declined from 51.1% to 1.7% of the total population. The city experienced rapid economic growth following Pakistan's independence, attracting migrants from throughout the country and other regions in South Asia. According to the 2017 Census of Pakistan, Karachi's total population was 16,051,521, with 14.9 million of those people residing in the urban areas of the city. Karachi is one of the world's fastest-growing cities, and has significant communities representing almost every ethnic group in Pakistan. Karachi holds more than two million Bangladeshi immigrants, a million Afghan refugees, and up to 400,000 Rohingyas from Myanmar