A portfolio is a collection of financial assets, such as securities, bonds, commodities, cash, and cash equivalents, such as exchange-traded funds (ETFs). The common belief is that the three main components of a portfolio are equities, bonds, and cash. Although this is frequently the case, it need not be the exception. Various types of assets, such as private investments, real estate, and fine art, may be included in a portfolio. A portfolio can be held and managed either by the individual who owns it, or by a money manager, financial advisor, or other finance expert.