Most investors fail to beat the S 500 over the long term, even with the help of sophisticated tools and strategies. That's why a lot of people choose to invest in exchange-traded funds (ETFs) that track the performance of this widely followed index.

Several ETFs aim to replicate the S&P 500, but some of the most popular ones are the SPDR S 500 ETF Trust (NYSEMKT: SPY), the SPDR Portfolio S 500 ETF (NYSEMKT: SPLG), the iShares Core S 500 ETF (NYSEMKT: IVV), and the Vanguard 500 Index Fund (NYSEMKT: VOO).

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Source Fool.com