According to BlackRock (NYSE: BLK), exchange-traded funds (ETFs) represent 12.6% of equity assets in the United States. Investors are gravitating toward ETFs for their low fees and built-in diversification. 

ETFs provide the perfect entry point if you're interested in a certain industry. Using an ETF as a foundational holding, and then adding positions in your favorite stocks over time, is a great way to manage risk. The Invesco Aerospace Defense ETF (NYSEMKT: PPA), the iShares Global Clean Energy ETF (NASDAQ: ICLN), and the Utilities Select Sector SPDR (NYSEMKT: XLU) stand out as three top ETFs that are worth a look now. 

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Source Fool.com