India's Capital
The capital of India is New Delhi. It is home to the Indian government, including the parliament, the country's highest court, and the official residence of the president. New Delhi sits in the northern part of India and forms one district within the much larger city of Delhi.
New Delhi and Old Delhi
It is easy to mix up "Delhi" and "New Delhi," but they are not quite the same thing. Delhi is a large, ancient city with a history stretching back many centuries. New Delhi is a specific, modern part of that city, built much more recently to serve as the capital. People often use the two names as if they mean the same place, but strictly speaking New Delhi is just one piece of the wider Delhi area.
Built to Be a Capital
Unlike many cities that grew slowly over time, New Delhi was deliberately planned and built as a capital. In the early twentieth century, the rulers of British India decided to move the capital from Calcutta and create a brand-new seat of government. New Delhi was designed with wide avenues and grand government buildings, and it was officially opened in 1931. When India became independent, New Delhi continued as the capital of the new nation.
Source
This article was written using information from Wikipedia.