Karachi is the largest city, main seaport and the financial capital of Pakistan, and the capital of the province of Sindh. With a city population of 15.5 million, Karachi is one of the world's largest cities, 13th largest urban agglomeration and the 20th largest metropolitan area in the world. Karachi is home to Pakistan's largest corporations, including those that are involved in textiles, shipping, automotive industry, entertainment, the arts, fashion, advertising, publishing, software development and medical research.

Karachi enjoys its prominent position because of its geographical location on a bay, making it the financial capital of the country. It is one of the fastest growing cities in the world. It was the original capital of Pakistan until the construction of Islamabad .