Amazon has more than 240 million active customers. At its peak, the online retailer's massive network of fulfillment centers can process more than 425 items per second.
It's a far cry from the mid-1990s. Back then, founder and CEO Jeff Bezos had only a few hearty colleagues working alongside him at his online bookstore, and they often labored into the wee hours of the night to fulfill the orders themselves.
Amazon went public in 1997, and its stock is up more than 15,000 percent since then. Despite bringing in billions of dollars in revenue, it has barely turned a profit. Investors wonder how high it might go, and their ranks are divided between the bulls, who believe Amazon stock still has room to rise, and the bears, who think the company is overvalued.