FSDHX is a mutual fund offered by Fidelity Advisor that focuses on providing high income through short duration investments. This Class C fund is designed for investors seeking a balance between income and capital preservation, with a lower expense ratio compared to other classes of the same fund. FSDHX invests primarily in fixed income securities with shorter maturities, making it less sensitive to interest rate changes. This fund may be suitable for investors looking for a conservative option within the high income category.