The big names in intelligent, voice-activated home assistants are Amazon’s Alexa, Microsoft's Cortana, the Google Assistant and the forthcoming Siri HomePod from Apple.
In terms of functionality, these systems don’t differ that much from each other. Most consist of a speaker with a built-in computer and microphone. Some models on the way will have a screen and Amazon has launched a smart camera with Alexa in the US.
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