Final answer:
The discount rate is the interest rate charged by the Federal Reserve Bank to commercial banks for loans, largely used for influencing the money supply and market interest rates.
Step-by-step explanation:
The discount rate is the interest rate the Federal Reserve Bank charges commercial banks for loans. This rate is used primarily for short-term loans provided through the Fed's discount window. There are three types of discount window programs — primary credit, secondary credit, and seasonal credit — each with its distinct interest rates. The primary credit rate is typically set higher than short-term market interest rates, influencing the overall money supply and market interest rates.
The Federal Reserve tends to use other tools, such as open market operations, more frequently than discount loans to implement monetary policy. However, raising or lowering the discount rate can still affect the borrowing behavior of banks, influencing the flow of credit in the economy.