The Amazon Echo is one of a range of hands-free speakers and devices from Amazon that can be controlled with your voice. The voice-controlled "personal assistant" on these devices is called Alexa, which will perform various tasks for you and control various systems. As well as being available on Echo devices from Amazon directly, Alexa is available on a lot of third-party devices like speakers or TVs as well as through the Alexa app on phones. Alexa is also available in some cars and in some wearables.
Source : https://www.pocket-lint.com/what-is-alexa-how-does-it-work-and-what-can-amazons-alexa-do/
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