Vanguard High Dividend Yield Index Fund is an open-end investment company. The Fund seeks to track the performance of an index that measures the investment return of common stocks of companies that are characterized by high dividend yield. Investor Shares are available to any investor who meets the fund's minimum purchase requirements. ETF Shares are purchased and sold through a broker. The Fund offers two classes of shares: investor Shares and exchange traded fund (ETF) Shares. The Fund focuses on investment approach designed to track the performance of the FTSE High Dividend Yield Index. The Fund's investment advisor is The Vanguard Group, Inc.