Becoming a stock market millionaire may seem like a lofty goal, but it's more attainable than you might think -- as long as you have the right strategy.

Exchange-traded funds (ETFs) are a low-maintenance type of investment, and they require very little effort on your part. With the right fund, you could potentially accumulate $1 million or more over time. Here's how.

There are countless ETFs to choose from, and the right fund for you will depend largely on your tolerance for risk and investing preferences. But there's one, in particular, that is a fantastic option for many investors: The S&P 500 ETF.

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Source Fool.com