Seeks to track the performance of an index of the full market of inflation-protected public obligations of the U.S. Treasury.Designed for long-term investors to generate returns more closely correlated with realized inflation.Given its longer duration, the fund can be expected to have more real interest rate risk, but also higher total returns relative to a shorter-duration TIPS fund.Invests in bonds backed by the full faith and credit of the federal government and whose principal is adjusted semiannually based on inflation.Can provide protection from inflationary surprises or ”unexpected inflation.”