The stock market can be daunting at times, but investing is one of the simplest, most effective ways to build wealth that lasts a lifetime.

While there are countless ways to invest, some require more effort than others. Investing in individual stocks can be a smart way to customize your portfolio, for example, but it demands plenty of research and upkeep -- and it can be incredibly expensive to get started.

Exchange-traded funds (ETFs) can be a more approachable option, whether you're new to investing or simply want a low-maintenance option. An ETF is a basket of securities bundled together into a single investment, so with just one fund, you're investing in dozens or hundreds of stocks at once.

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Source Fool.com