Do you know ETF can be a good tool for active trading too? Plus, by having ETF diversifying your risks to dozens, if not hundreds, of underlying investments, you also reduce your actively traded portfolio's volatility.

If actively managing a long-term portfolio isn't spicy enough for your tastes, ETFs may still be the right flavor for your palette. While long-term investors might eschew active- and day-trading strategies, ETFs are the perfect vehicle if you are looking for a way to move frequently into and out of an entire market or a particular market niche. Since ETFs trade intraday, like stocks or bonds, they can be bought and sold rapidly in response to market movements, and unlike many mutual funds, ETFs impose no penalties when you sell them without holding them for a set period of time.

While it is true that you must pay a commission each time you trade ETFs, if you are aware of this cost and the dollar value of your trade is high enough, the commission cost is nominal. Consider, for example, a $10 commission on a $10,000 trade. At .1%, the cost is hardly worth mentioning.

Also, since they trade intraday, ETFs can be bought long or sold short, used in hedge strategies and bought on margin. If you can think of a strategy that can be implemented with a stock or bond, that strategy can be applied with an ETF - but instead of trading the stock or bond issued by a single company, you are trading an entire market or market segment.