In the 30 years since Amazon (NASDAQ: AMZN) was founded, it's become one of the world's most renowned companies. It's one of the top three most recognized companies, according to financial services company IG Group, and was recently named one of the world's most admired companies -- for the eighth consecutive year -- by Fortune magazine.

The company rose to prominence as an online retailer with its instantly recognizable "smiley face" boxes but has expanded its empire into cloud computing, personal electronics, streaming video and music, and most recently, artificial intelligence (AI).

Investors are most excited about the potential offered by AI, and cloud computing has long been Amazon's most important breadwinner. However, investors might be surprised to learn that another area of the company's business is generating the fastest growth.

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Source Fool.com