Any iPhone owner knows (NASDAQ: AAPL) has been aggressively building an advertising business. The growing number of sponsored listings in the App Store search is all the evidence you need.

In fact, at least one analyst believes Apple could generate $7.5 billion in ad sales across the App Store, News, Stocks, Maps, Podcasts, and TV+. And that number could climb significantly higher in the near future, as Apple works to develop key ad technology that would unlock a lot of growth for the business.

But Apple has a second, much bigger source of ad revenue than selling ads in the App Store and its other apps. And investors recently learned more details about just how big this extremely high-margin ad revenue is.

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Source Fool.com