In the banking system, central banks (like the RBI in India) mandate commercial banks to hold a certain percentage of their deposits as reserves. These mandatory reserves are primarily composed of the Cash Reserve Ratio (CRR), which is the amount of funds banks must keep with the RBI, and the Statutory Liquidity Ratio (SLR), which is the percentage of deposits banks must maintain in specified liquid assets (like government securities, gold, and cash) with themselves. Any reserves held by commercial banks with the central bank (RBI) or as vault cash that are above the required statutory minimum are referred to as Excess Reserves. Banks may hold excess reserves for various reasons, such as meeting unexpected withdrawal demands, facilitating interbank payments, or in anticipation of future lending opportunities.