The iPath S&P GSCI Crude Oil Total Return Index ETN (OILNF) is a mutual fund that tracks the performance of the S&P GSCI Crude Oil Total Return Index. This index is designed to reflect the total return of a portfolio of exchange-traded futures contracts on crude oil. The fund provides investors with exposure to the crude oil market, allowing them to potentially benefit from price movements in this commodity. As an exchange-traded note (ETN), the fund is a debt instrument issued by a financial institution and is subject to credit risk. Investors should carefully consider the risks and potential rewards of investing in this fund before making any investment decisions.