VBTIX is a mutual fund that tracks the performance of the total U.S. investment-grade bond market. It is managed by Vanguard and is designed for institutional investors. This fund provides a diversified portfolio of high-quality bonds, making it a suitable option for investors seeking stability and income in their investment portfolio. With a low expense ratio and a focus on long-term growth, VBTIX offers a cost-effective and efficient way to invest in the bond market.