Exchange-traded funds (ETFs) generally provide a safer, lower-risk way to invest in particular sectors of the economy when compared to buying individual stocks. With many different funds to choose from, you should be able to find one that will help you invest broadly or narrowly, based on your specific strategy. Most will help you diversify your portfolio and improve your chances of seeing strong gains while lowering the likelihood of a poor return.

Many of these ETFs focus on high-performing growth stocks . And investing in these types of funds has yielded some strong returns for investors in recent years. Three funds in particular have more than doubled in value in just the past three years. They are: Invesco QQQ Trust ( QQQ 0.32% ) , Vanguard Information Technology Index Fun

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