Investing in the S&P 500 is great if you want minimal risk, and to generate some good, modest returns over the long haul. But what if you wanted more than that? There are plenty of exchange-traded funds (ETFs) that can offer lots of diversification, and that could have the potential to generate superior returns over the broad index.

One fund that has routinely outperformed the S&P 500 index is the Vanguard Information Technology Index Fund ETF (NYSEMKT: VGT). Here's why you should consider adding this ETF to your portfolio.

Over the past decade, the S&P 500 has produced total returns (including dividends) of more than 230%. That averages out to a compound annual growth rate (CAGR) of 12.7%, which is better than the index's long-run average of 9.7%. But as good as that has been, that still pales in comparison to the mammoth 530% returns the Vanguard Information Technology Index Fund has amassed during that time. Those returns average out to a CAGR of 20.2%.

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Source Fool.com