A unit investment trust (UIT) is a specific type of investment vehicle that allows investors to own a basket of securities, such as bonds or stocks, in a single portfolio. However, there are various alternative terms that can be used to describe similar investment structures. For example, a closed-end fund operates like a UIT but is traded on an exchange. A mutual fund is another type of investment that pools money from multiple investors and invests in a variety of assets. Lastly, an exchange-traded fund (ETF) is a type of investment that trades like a stock and typically tracks an index, such as the S&P 500. Each of these investment structures has its own unique benefits and drawbacks, and investors should carefully consider their options before investing.