There's no doubt that the S 500 is the most closely watched stock market index. The group of 500 or so large and profitable enterprises provides investors with a clear gauge of how stocks are performing. And it has been a popular investment choice historically.

In the past decade, the S 500 has generated a total return of 232%. That translates to an impressive 12.7% per year. However, there's one thriving exchange-traded fund (ETF) that has performed even better that investors should consider buying right now.

Investors need to get familiar with the Invesco QQQ Trust (NASDAQ: QQQ). This ETF tracks the performance of the Nasdaq-100 index, which consists of the 100 biggest non-financial businesses trading on the Nasdaq Composite.

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Source Fool.com