Monetary policy refers to actions undertaken by central banks to regulate money supply and credit conditions to promote economic goals like price stability and growth. The key objectives are ensuring economic stability, achieving price stability, and promoting growth. Tools include open market operations, bank rate/discount rate, cash reserve ratio, and moral suasion. Central banks use these to contract money supply and credit during inflation or expand them during recession by buying/selling government securities and adjusting policy rates and reserve requirements. However, monetary policy faces limitations from time lags in implementation and effects, difficulties in forecasting, and underdeveloped financial markets in some countries.