Mumbai, formerly Bombay, is the capital of the Indian state of Maharashtra. The city proper is the second most populous city in the world, with approximately 14 million inhabitants.[1] Along with the neighbouring suburbs of Navi Mumbai and Thane, it forms the world's 4th largest urban agglomeration, with around 19 million people. Mumbai lies on the west coast of India and has a deep natural harbour. Mumbai's port handles about 60% of India's maritime cargo. Mumbai is the commercial and entertainment centre of India, generating 5% of India's GDP, and accounting for 25% of industrial output, 40% of maritime trade, and 70% of capital transactions to India's economy. Mumbai is home to important financial institutions such as the Reserve Bank of India, the Bombay Stock Exchange, the National Stock Exchange of India and the corporate headquarters of numerous Indian companies and multinational corporations. The city also houses India's Hindi film and television industry, known as Bollywood. Mumbai's business opportunities, as well as its potential to offer a higher standard of living, attract migrants from all over India and, in turn, make the city a potpourri of many communities and cultures.

Bangalore is the capital of the Indian state of Karnataka. Located on the Deccan Plateau in the south-eastern part of Karnataka, Bangalore is India's third most populous city and fifth-most populous urban agglomeration. As a large and growing metropolis, Bangalore is home to some of the most well-recognized colleges and research institutions in India. Numerous public sector heavy industries, software companies, aerospace, telecommunications, and defence organisations are located in the city. Bangalore is known as the Silicon Valley of India because of its preeminent position as the nation's leading IT employer and exporter. A demographically diverse city, Bangalore is a major economic hub and the fastest growing major metropolis in India.

Kolkata formerly Calcutta, is the capital of the Indian state of West Bengal. It is located in eastern India on the east bank of the River Hooghly. When referred to as Calcutta, it usually includes the suburbs, and thus its population exceeds 15 million, making it India's third-largest metropolitan area and urban agglomeration. This also makes it the world's 8th largest metropolitan area as defined by the United Nations. Kolkata served as the capital of India during the British Raj until 1911. Once the centre of modern education, industry, science, culture and politics in India, Kolkata has witnessed intense political violence, clashes and economic stagnation since 1954. Since the year 2000, economic rejuvenation has spurred on the city's growth. Like other metropolitan cities in India, Kolkata continues to struggle with the problems of urbanisation: poverty, pollution and traffic congestion. Kolkata is noted for its revolutionary history, ranging from the Indian struggle for independence to the leftist and trade union movements.

Chennai formerly known as Madras is the capital city of the Indian state of Tamil Nadu. It is famous for its culture and tradition. Chennai is the fourth most populous metropolitan area and the fifth most populous city in India. Located on the Coromandel Coast of the Bay of Bengal, Chennai city had a population of 4.34 million in the 2001 census within its municipal corporation. The urban agglomeration of metropolitan Chennai has an estimated population over 8 million people. The city was established in the 17th century by the British, who developed it into a major urban centre and naval base. By the 20th century, it had become an important administrative centre, as the capital of the Madras Presidency. Chennai's economy has a broad industrial base in the automobile, technology, hardware manufacturing, and healthcare industries. The city is India's second largest exporter of software, information technology (IT) and information-technology-enabled services (ITES). A major chunk of India's automobile manufacturing industry is based in and around the city. Chennai Zone contributes 39 per cent of the State’s GDP. Chennai accounts for 60 per cent of the country’s automotive exports and is referred to as the Detroit of South Asia. Chennai hosts a large cultural event, the annual Madras Music Season, which includes performances by hundreds of artists. The city has a vibrant theatre scene and is an important centre for the Bharatanatyam, a classical dance form. The Tamil film industry, known as Kollywood, the second largest movie industry in India, is based in the city; the soundtracks of the movies dominate its music scene.