Warren Buffett isn't known for his tech investing -- even less so, artificial intelligence (AI) stocks . But right now, Buffett's holding company has bet nearly $2 billion on a business that sits at the center of the AI revolution. Most investors don't realize this well-known company is an AI giant, making the stock a solid long-term bet for those looking to follow one of Buffett's biggest positions right now.

Forget everything you know about Amazon

Most people think of Amazon ( AMZN 0.26% ) as an e-commerce business. And that's certainly true. Nearly 40% of all e-commerce sales in the U.S. are facilitated through Amazon. And most of Amazon's revenue still is generated from digital retail sales.

But when you look at operating profits , the story shifts dramatically. Most of

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