The Invesco Senior Income Trust (VVR) is a mutual fund that primarily invests in a diversified portfolio of senior loans and other income-producing securities. These investments are typically issued by companies with below-investment-grade credit ratings, making them higher risk but also potentially higher yielding. The fund aims to provide investors with a steady stream of income through its investments in these fixed-income securities. It may also invest in other types of debt securities, such as corporate bonds and mortgage-backed securities. The fund is managed by Invesco, a global investment management firm with a strong track record in fixed-income investing.