In 2014, Amazon debuted a simple but industry-changing product: the smart speaker. Technically the Amazon Echo was just a microphone attached to the internet that you installed in your home. But it let users ask a digital assistant, Alexa, thousands of questions and commands, and it was a hit. Before long, Google and Apple followed with their own smart speakers, and today, a device that began as a curiosity has become commonplace: one in five US households now owns a smart speaker.
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