Exchange-traded funds (ETFs) can be excellent tools for achieving diversification or gaining exposure to a particular theme or industry.

Chock-full of big tech-orientated companies, the Vanguard Growth ETF (NYSEMKT: VUG) is up a staggering 37.4% over the past year and is hovering around an all-time high. The massive fund has over $220 billion in net assets and continues to outperform the S&P 500 and the Nasdaq Composite. But there are plenty of other, smaller ETFs that could also be worth a look.

Two that stand out are the Robo Global Robotics and Automation Index ETF (NYSEMKT: ROBO) and the Ark Autonomous Technology Robotics ETF (NYSEMKT: ARKQ). Here's why all three ETFs are worth buying now.

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Source Fool.com