Over the past decade, American investors increasingly have turned to mutual funds to save for retirement and other financial goals. Mutual funds can offer the advantages of diversification and professional management. But, as with other investment choices, investing in mutual funds involves risk.  In addition, fees and taxes can diminish a fund’s returns. This brochure explains the basics of mutual fund investing — how mutual funds work, what factors to consider before investing, and how to avoid common pitfalls.