This document defines key concepts related to money, money supply, and banking in India. It discusses that money supply refers to the total stock of money held by the public at a given time, and includes currency and demand deposits. The central bank of India, called the Reserve Bank of India (RBI), acts as the banker, lender of last resort, and regulator of other commercial banks. It controls money supply through various instruments like bank rate, cash reserve ratio, and open market operations. Commercial banks accept deposits and provide loans, creating money through demand deposits, while the RBI issues currency and oversees the banking system.