Amazon’s next pillar could be built on a foundation of silicon. In a new interview with Fortune, Amazon founder and Executive Chair Jeff Bezos says the company’s custom chip business is on track to become one of Amazon’s most durable businesses, placing it alongside Marketplace, Prime, and Amazon Web Services as a core pillar of the company. “What I see right now is that our chips business, our silicon business, is lining up to be our next pillar.” The real potential for Amazon’s chips business could come in going beyond the walls of its own data centers. “The growth in AI has been so significant, but we have a chips business that we built over the last decade here that is growing very quickly,” he said.