Inflation is a general increase in prices and decrease in the purchasing value of money, often caused by excess money supply or demand. Anti-inflationary measures aim to curb this excess. Monetary policy tools used by the Reserve Bank of India (RBI) include the Bank Rate, Cash Reserve Ratio (CRR), Statutory Liquidity Ratio (SLR), and Open Market Operations (OMO). An increase in the Bank Rate makes borrowing more expensive for commercial banks from the RBI, which in turn leads to higher lending rates for customers. This discourages borrowing and reduces the money supply and credit in the economy, thus helping to control inflation. Decreasing the Bank Rate, reducing CRR, and Open Market Purchases (RBI buys securities) are all expansionary policies that increase money supply and are used to stimulate the economy, potentially exacerbating inflation.