For instance, robotics may be seen as a nascent industry, and the industry is quickly booming. The ROBO Global Robotics & Automation Index ETF (NYSEArca: ROBO), the original ETF dedicated to robotics investing, provides investors with the ability to gain targeted exposure to the robotics industry. Robotics- or automation-related products and services include any technology, service or device that supports, aids or contributes to any type of robot, robotic action or automation system process, software or management.

The PowerShares QQQ (NasdaqGM: QQQ), which tracks the tech-heavy Nasdaq-100 Index, has been a go-to ETF option for investors seeking broad market exposure with a big emphasis on the U.S. technology segment. The underlying Nasdaq-100 includes 100 of the largest domestic and international nonfinancial companies listed on the Nasdaq Stock Market based on market capitalization, with a 61.1% tilt toward information technology names and even its 22.3% weight in consumer discretionary includes innovators like Amazon 9.4%, Netflix 1.8% and Tesla 0.7%.

Additionally, the Reality Shares Nasdaq NexGen Economy ETF (NasdaqGM: BLCN) invests in the companies that are developing the innovative and transformational blockchain technology, which many have associated with the bitcoins and cryptocurrencies. Potential investors, though, should keep in mind that this ETF does not invest in cryptocurrencies, like bitcoins.

These Blockchain Companies are committing material resources to further the use and deployment of blockchain technology to streamline the distribution and verification of cross-border payments; more efficiently store and secure cloud-based digital data; facilitate trusted transactions based on data security and privacy; and mitigate risk in supply chain management, among other uses.

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