Currency Appreciation and Profit Opportunities in Crosses

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Some currencies appreciate substantially against the dollar, while others gain barely a few basis points. This difference in performance against the greenback creates profit opportunities for market players who choose to trade in currency crosses. Crosses are simply a measure of the relative strength of an individual currency against the dollar. Crosses are distinguished by the fact that they do not include the dollar as either the numerator or the denominator of the pair. As such, they offer traders a tremendous opportunity to make far more nuanced bets in the currency market than the simple pro- or anti-dollar trade. Remember, trading of forex poses significant risks and is not suitable for all persons. Past performance is not necessarily indicative of future results.
Source: http://www.investopedia.com/articles/forex/05/CurrencyCross.asp