Money market funds can be purchased directly from a brokerage firm, mutual fund firm, bank, or even the U.S. Treasury. Some banks offer their own proprietary funds that offer money market investment opportunities.
Money market funds are fixed-income mutual funds that invest in debt securities that are characterized by their short maturities and small credit risk. Money market funds include U.S. Treasury bonds, certificates of deposit, federal agency notes, Eurodollar deposits, repurchase agreements and corporate bonds. Money market funds are low-risk, low-return assets. They are generally used as short term investments that an investor can quickly sell when a more lucrative opportunity appears.