Mutual funds pool money from investors and invest it in stocks, bonds, and money market securities. Investors receive units that can be redeemed for their share of the fund's net asset value. There are two main types of mutual funds - open-ended funds that investors can purchase or redeem units from at any time, and closed-ended funds that have a set duration. A new fund offer refers to the initial offering of a new mutual fund, while the net asset value is calculated daily based on the market value of the fund's holdings. Mutual funds provide investors easy access to a professionally managed, diversified portfolio.