In the past 10 years, the S 500 index has generated a total return of 240%. This means a $10,000 investment in May 2014 would be worth $34,000 today. That's certainly a respectable gain that should please any investor. This broad index of the largest and most profitable U.S.-based companies gets a lot of the attention as it's the most widely followed barometer to assess how the stock market is performing.

However, there's one booming exchange-traded fund (ETF) that beat the S 500 in the past and is almost bound to keep doing so over the long term.

The Invesco QQQ Trust (NASDAQ: QQQ) has produced a total return of 460% in the past 10 years, easily crushing the S 500's gain. That same $10,000 would leave you with a balance of $56,000 right now. This is a huge gap that we can't ignore. In fact, this outperformance holds true even if we look back over the past three- and five-year periods.

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Source Fool.com