What is the difference between the fed funds rate and CD rates?

The federal funds rate is the interest rate at which banks lend money to each other overnight, set by the Federal Reserve. CD rates, on the other hand, are the interest rates offered on certificates of deposit by banks to customers who deposit money for a fixed period of time. The fed funds rate influences overall interest rates in the economy, including CD rates, but CD rates are set by individual banks based on various factors.