This ETF offers exposure to long-dated Treasuries, an asset class that is generally safe in terms of credit risk but that can offer attractive return potential by exposing investors to interest rate risk. The index underlying this fund consists of Treasury STRIPS with maturities ranging from 20 to 30 years, a unique approach to accessing long-dated government debt. EDV will exhibit a high level of sensitivity to interest rate changes, surging when rates climb but plummeting on speculation that the Fed will push rates higher. For investors who believe that rates will hold steady or decline, EDV can be an attractive source of return, as the yields delivered are significantly higher than short-term Treasuries. Like most Vanguard ETFs, EDV is appealing to investors keeping a close eye on fees; the expense ration is among the lowest in the Government Bonds ETFdb Category, and commission free trading in Vanguard accounts may further increase the appeal to cost conscious investors. TLT offers generally exposure, though the underlying index doesn't consist of STRIPS. For investors looking to bet against long-term Treasuries, TBT and TBF may be interesting options.