Sister cities of Chennai

Chennai /tʃɨˈnaɪ/ (also known as Madras /məˈdrɑːs/) is the capital city of the Indian state of Tamil Nadu. Located on the Coromandel Coast off the Bay of Bengal, it is the biggest industrial, commercial center, and a major cultural, economic and educational center in South India. The area around Chennai had been part of successive South Indian kingdoms for many centuries. The recorded history of the city began in the colonial times, specifically with the arrival of British East India Company and the establishment of Fort St. George in 1644. The British defended several attacks from the French colonial forces, and from the kingdom of Mysore, on Chennai's way to becoming a major naval port and presidency city by the late eighteenth century. Following the independence of India, Chennai became the capital of Tamil Nadu and an important centre of regional politics that tended to bank on the Dravidian identity of the populace.

According to the provisional results of 2011 census, the city had 4.68 million residents, making it the sixth most populous city in India; the urban agglomeration, which comprises the city and its suburbs, was home to approximately 8.9 million, making it the fourth most populous metropolitan area in the country and 31st largest urban area in the world. Chennai's economy has a broad industrial base in the automobile, computer, technology, hardware manufacturing and healthcare sectors. As of 2012, the city is India's second largest exporter of information technology (IT) and business process outsourcing (BPO) services. A major part of India's automobile industry is based in and around the city thus earning it the nickname "Detroit of India".

Chennai is an important centre for Carnatic music and hosts a large cultural event, the annual Madras Music Season, which includes performances by hundreds of artists. The city has a diverse theatre scene and is one of the important centres for Bharata Natyam, a classical dance form. The Tamil film industry, colloquially known as Kollywood, is based in the city. The city is host to the third largest expatriate population in India after Mumbai and Delhi, with 35,000 in 2009 and steadily climbing to 82,790 in 2011.