A closed-end fund that offers investors the ability to buy a security that represents a portfolio of investments with a specific investment strategy. These products use funds raised through a public offering to invest in a portfolio of securities, which are actively managed to create income streams for investors, typically through a combination of dividends, capital gains, interest payments, and in some cases, income from derivative investment strategies. These funds are not directly related to an operating business. Some examples are: funds of income funds, senior loan funds, mortgage-backed security funds, and commodity funds.