What is a Money Market Funds? The money market consists of short-term debt instruments, mostly Treasury bills. This is a safe place to park your money. You won't get great returns, but you won't have to worry about losing your principal. A typical return is twice the amount you would earn in a regular checking/savings account and a little less than the average certificate of deposit (CD).
A money market fund (also called a money market mutual fund) is an open-ended mutual fund that invests in short-term debt securities such as US Treasury bills and commercial paper. Money market funds are widely (though not necessarily accurately) regarded as being as safe as bank deposits yet providing a higher yield.
A money market mutual fund is a type of fixed income mutual fund that invests in debt securities characterized by their short maturities and minimal credit risk. Money market mutual funds are among the lowest-volatility types of investments. Income generated by a money market fund can be either taxable or tax-exempt, depending on the types of securities in which the fund invests.