Money market mutual funds invest mostly in money market instruments such as treasury bills, certificate of deposits, and commercial papers with maturity of up to one year. Money market instruments are unsecured debt instruments offering fixed interest rate. They are usually traded over the counter through certified brokers or money market mutual funds. These schemes are considered ideal for conservative investors with little tolerance for risk. Since these funds invest in debt instruments with short tenure, they are not very sensitive to interest rate changes. It is not advisable to park money needed for very short-term needs in these funds.