What is Reserve Bank Of India?

Legal Definition
The Reserve Bank of India (RBI) is India's central banking institution, which controls the monetary policy of the Indian rupee. It commenced its operations on 1 April 1935 during the British Rule in accordance with the provisions of the Reserve Bank of India Act, 1934. The original share capital was divided into shares of 100 each fully paid, which were initially owned entirely by private shareholders. Following India's independence on 15 August 1947, the RBI was nationalised on 1 January 1949.

The RBI plays an important part in the Development Strategy of the Government of India. It is a member bank of the Asian Clearing Union. The general superintendence and direction of the RBI is entrusted with the 21-member Central Board of Directors: the Governor, 4 Deputy Governors, 2 Finance Ministry representatives, 10 government-nominated directors to represent important elements of India's economy, and 4 directors to represent local boards headquartered at Mumbai, Kolkata, Chennai and New Delhi. Each of these local boards consists of 5 members who represent regional interests, and the interests of co-operative and indigenous banks.

A Central Bank is an independent apex monetary authority which regulates banks and provides important financial services like storing of foreign exchange reserves, control of inflation, monetary policy report. A Central Bank is known by different names in different countries. The functions of a Central Bank vary from country to country and are autonomous or quasi-autonomous body and perform or through another agency vital monetary functions in the country. A central bank is a vital financial apex institution of an economy and the key objects of central banks may differ from country to country still they perform activities and functions with the goal of maintaining economic stability and growth of an economy.

The bank also active in promoting financial inclusion policy and is a leading member of the Alliance for Financial Inclusion (AFI).

The bank is often referred to by the name Mint Street.
-- Wikipedia
Legal Definition
Founded in 1935, it is the central bank in India.