Vanguard Mortgage-Backed Securities Index Fund Admiral Shares 

This economical index fund primarily invests in pass-through securities backed by U.S. mortgages, issued by government-sponsored entities such as GNMA, FNMA, and FHLMC. Beyond standard bond market fluctuations, a notable exposure is prepayment risk; consequently, the fund's yield is prone to decrease during periods of high mortgage refinancing activity. This offering may suit investors aiming for consistent monthly income over a medium-term horizon, intending it for the fixed income segment of their investment portfolio.