Amazon Echo is a voice-controlled interface which uses Alexa. Through the wireless network it can control plenty of features in your home, like to turn on/switch of the lights, switches, thermostats, to listen to Amaxon music unlimited (much like Spotify). You can ask it questions and get news or sports updates, it can be used as an alarm and much more. The device can easily be used by anybody. This device can even pick up your voice whilst playing music. It is possible to purchase things by voice (as long as you have an account with Amazon).
Like a smart Phone the device is constantly learning and improving and adding new skills.
Se also youtube.com/watch (last checked April 2020).
Amazon, amazon.com (last checked April 2020)