Exchange-traded funds (ETFs) have become increasingly sophisticated and less expensive. There's nothing quite like investing in an individual company's stock and watching it grow over time, but ETFs have value even for seasoned investors.

By providing diversification in a theme or sector, an ETF is one of the simplest ways to dip your toes into something new or access foundational holdings.

Here's why these three Motley Fool contributors believe the Vanguard Growth ETF (NYSEMKT: VUG), the VanEck Semiconductor ETF (NASDAQ: SMH), and the Global X U.S. Infrastructure Development ETF (NYSEMKT: PAVE) are three top ETFs.

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Source Fool.com