IWM ETF is one of several offering exposure to the Russell 2000 Index, a widely followed measure of small cap U.S. stocks. Given this investment objective, IWM may be useful in a number of different ways; more active investors may use this fund as a way to establish short-term exposure to a risky asset class when risk tolerance is expected to climb, while IWM can also be appealing as a way of accessing an asset class that should be included in any long-term, buy-and-hold portfolio.