Amazon's Alexa won CES this week.

Amazon's virtual assistant, which first appeared more than two years ago on Amazon's Echo smart speaker, seemed to be popping up everywhere at the annual International CES trade show in Las Vegas this week.

Amazon opened Alexa to third-party hardware developers in the summer of 2015. Now, a year and a half later, the number of devices that support Alexa are dizzying. (We also learned this week that Alexa now offers more than 7,000 "skills," which is what Amazon calls apps or third-party capabilities.)

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