(NASDAQ: AAPL) has grown revenue and profit into the billions of dollars over the years thanks to its top technology products -- from the Mac to the iPhone. And recently, the company even reached a record number of active installed devices -- more than 2.2 billion -- indicating consumers continue flocking to Apple's products.

This could allow Apple to grow revenue yet another way, and this revenue source actually may become the company's next billion-dollar growth driver. The trend has already gotten started. Let's take a closer look.

Image source: Getty Images.

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Source Fool.com