Lucknow is a metropolis and the second largest city of the Indian state of Uttar Pradesh where it serves as the capital and the administrative headquarters of the eponymous district and division. The city had a population of 2.8 million according to the 2011 census making it the eleventh most populous city and the twelfth-most populous urban agglomeration of India. It is an important centre of education, commerce, aerospace, finance, pharmaceuticals, information technology, design, culture, tourism, music, and poetry. Lucknow, along with Agra and Varanasi, forms the backbone of the Uttar Pradesh Heritage Arc.