The Nuveen Municipal Credit Income Fund of Benef Interest (NZF) is a mutual fund that primarily invests in municipal bonds, which are issued by state and local governments to fund public projects. This fund aims to provide investors with a steady stream of tax-free income by investing in high-quality municipal bonds with strong credit ratings. It may also invest in other fixed-income securities, such as corporate bonds and mortgage-backed securities, to diversify its portfolio. The fund is managed by Nuveen, a leading investment management firm, and is suitable for investors seeking tax-exempt income and a moderate level of risk.