Growth stocks are soaring these days as investors feel more optimistic about the economy moving forward and place bets on companies that generally excel in these sorts of environments. On top of that, companies focusing on the newish high-growth area of artificial intelligence (AI) are also attracting investors' attention.

But with all the growth stocks out there, it may seem intimidating to select just the right ones to boost your portfolio -- or even potentially make you a millionaire -- over time. Don't worry, though. There's an easier way to bet on growth stocks and win, and that's by investing in an exchange-traded fund (ETF).

The Vanguard Mega Cap Growth ETF (NYSEMKT: MGK) is a good example. It offers exposure to many of today's top growth stocks -- so you'll get a lot of bang for your buck. But could an investment in this ETF, like an investment in just the right hand-picked selection of growth stocks, make you a millionaire? Let's find out.

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Source Fool.com