This ETF is designed to track a benchmark index comprised of U. S. dollar-denominated bonds, which include both higher-quality (investment-grade) and higher-risk (high-yield) debt securities. The fund's investment policy requires that a minimum of 80% of its total assets be allocated to the bonds that constitute this underlying index, or to similar instruments like To-Be-Announced (TBA) securities, provided they replicate the economic performance of those index components.