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The reserve requirement is the amount of money that banks must hold in reserves (either in their vaults or deposited with the central bank) as a percentage of their deposit liabilities. This requirement is imposed by the central bank to ensure that banks have enough cash on hand to meet their obligations and prevent bank runs.

Banks operate on the principle of fractional reserve banking, which means that they are allowed to lend out a portion of their deposits and hold only a small amount of cash in reserve. This system allows banks to create new money through the lending process, as every dollar they lend out is then deposited into another bank account, increasing the overall money supply.

When the central bank wants to expand the money supply, it can reduce the reserve requirement. This means that banks will be required to hold less cash in reserve for every dollar they have in deposits, allowing them to create more loans and increase the money supply.

With a lower reserve requirement, banks have more funds available to lend out. As banks increase their loans, borrowers deposit these newly-created funds (called additional reserves) into their bank accounts, which increases the overall amount of deposits in the banking system.

The process of banks creating loans, borrowers depositing those funds, and banks using those new deposits to create even more loans is known as the money multiplier effect. This process continues as long as there are available reserves to lend out, leading to an expansion of the money supply in the economy. By reducing the reserve requirement, the central bank allows banks to lend out a greater percentage of their deposits, expanding the money supply through the money multiplier effect. This can stimulate economic growth and increase liquidity in the financial system. However, it's essential to monitor this process closely to prevent excessive money creation, which could lead to inflation and financial instability.