What Are Exchange-Traded Funds?

WHAT ARE EXCHANGE-TRADED FUNDS?
While you cannot invest directly in a market index such as the S&P 500 or the
Dow Jones Industrials, you can invest in a representative sample of the
securities that make up a market index. These investments, called exchange
traded funds, or ETFs, are passively managed portfolios designed to track the
performance of specific indexes or [...]