The central bank is the apex bank that controls the entire banking system of a country. It is the sole issuer of currency and regulates the money supply. As the central bank of India, the Reserve Bank of India (RBI) performs key functions such as being the banker and financial advisor to the government, issuing banknotes, controlling foreign exchange reserves, acting as the lender of last resort, and regulating the credit system. The RBI has an exclusive right to issue notes which are legal tender, sets policies to manage the money market, and oversees commercial banks through supervisory roles like setting cash reserve and statutory liquidity ratios.