Believe it or not, Exchange-Traded Funds are one of the "newer" asset classes out there, with the first ETF debuting in 1993.
Once the sole domain of Wall Street, since then many investors have gravitated toward them as a supplement and, in many cases, a substitute for stodgy mutual funds.
This week, the ETF industry reached an important milestone: A Strategic Insight/BNY Mellon report confirms that the ETF market in the United States has surpassed $1 trillion in assets.