The best chance of long-term investing success is having a diversified portfolio. For most investors, that means a group of 25 to 30 stocks that vary across industry, size, and other factors. But adding exchange-traded funds (ETFs) can bring this strategy up several notches, providing exposure to hundreds or thousands of stocks while minimizing risk.

There are niche ETFs that investors can buy to benefit from specific trends or investment types without making a bet on a single stock or putting too much money into a small group. A great example is the Global X Artificial Intelligence & Technology ETF, which gives investors exposure to artificial intelligence (AI) stocks and has beaten the market over the past year.

That will appeal to some investors. But there are other ETFs that belong in every investor's portfolio.

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Source Fool.com