The Fidelity Advisor Convertible Securities Fund (FIQVX) is a mutual fund that primarily invests in convertible securities, which are bonds or preferred stocks that can be converted into common stocks. This fund is classified as Class Z, which typically indicates a higher minimum investment and lower fees compared to other classes. The fund is managed by Fidelity Investments and aims to provide investors with a balance of income and potential for capital appreciation through its diversified portfolio of convertible securities.