The S&P 500 is still up on the year, but it has pulled back in April. Investors who are worried about further downward momentum have come to the right place. Exchange-traded funds (ETFs) can be an excellent way to achieve diversification and peace of mind during a sell-off -- knowing that you have exposure to multiple different industries and themes.

Here's why the Vanguard Value ETF (NYSEMKT: VTV) is a good long-term investment and resilient to a stock market sell-off.

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Source Fool.com