Money market instruments are short-term, highly liquid debt instruments with maturities of one year or less — used by governments, corporations, banks, and financial institutions to manage short-term funding needs and invest temporary cash surpluses. They are characterised by high credit quality, low risk, and near-cash liquidity — forming the foundation of the money market, which bridges short-term borrowers and investors. In India, the key money market instruments include Treasury Bills (91-day, 182-day, and 364-day T-Bills issued by the RBI), Commercial Papers (short-term unsecured instruments issued by corporations), Certificates of Deposit (short-term instruments issued by banks), Call Money and Notice Money (overnight and short-term interbank lending), Repo and Reverse Repo agreements (collateralised short-term borrowing against government securities), and Cash Management Bills (CMBs). For retail investors in India, money market mutual funds — which invest primarily in these instruments — provide an accessible, liquid, and relatively safe avenue for parking short-term surplus funds, earning returns superior to savings bank accounts while maintaining near-instant liquidity. The RBI's Monetary Policy Committee's repo rate decisions directly influence money market instrument yields — making them sensitive to changes in India's monetary policy stance.