VFIUX is a mutual fund offered by Vanguard that focuses on intermediate-term Treasury securities. It is designed for investors seeking a low-risk investment option with moderate returns. The fund primarily invests in US Treasury bonds with maturities between 3 and 10 years, providing a balance between stability and potential for growth. As an Admiral Shares fund, it offers lower expense ratios and higher minimum investment requirements compared to other Vanguard funds. VFIUX is a suitable choice for investors looking for a conservative fixed-income investment option.