Although Apple's (NASDAQ: AAPL) business started in the personal computing market, that is no longer its driving force. Instead, iPhones have become the company's dominant product line, although its other offerings are still valuable.

However, investors also must realize that because the tech titan is highly concentrated in one product line, it could be a risk. So let's look at the iPhone's importance to Apple and see what that means for the stock.

In Apple's first quarter of fiscal 2023 (ended Dec. 31, 2022), iPhone sales made up 56% of the company's $117 billion in total revenue. The rest of the segments are somewhat spread out in terms of revenue contribution mix.

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Source Fool.com