Financial technology (fintech) is an industry exploding with potential. And as the opportunity grows, more companies have been entering the ring.

But they're not all the same. You can diversify by buying fintech-focused exchange-traded funds (ETF) like Cathie Wood's Ark Fintech Innovation ETF, which has gained more than double the S&P 500 during the past year.

There are reasons to buy single stocks, though. You might be looking for a great stock to fill out a diversified portfolio, or you might be interested in buying safer stocks than Wood's growth-oriented picks.

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Source Fool.com