The document discusses the differences between open-end and closed-end funds. It outlines the three primary types of open-end funds: front-end funds, back-end funds, and low-level load funds. It describes the two main fees built into funds as management expenses and sales charges. It provides examples of how fees work for each type of open-end fund. The document cautions that returns stated as net of fees and expenses may not fully reflect the impact of fees depending on the example.