Echo is a smart Speaker that can be controlled using your voice. It comes with Alexa voice service which can perform many other things.
Echo - Smart Voice Assistant - Smartify Store
Echo Sub - Smart Voice Assistant- Smartify Store
Echo Voice Remote - Smart Accessory - Smartify Store
Echo - Smart Voice Assistant - Smartify Store
Echo Spot - Smart Voice Assistant - Smartify Store
Top 10 Ways to Use Voice Assistants
How to connect your smart home gadgets with Alexa
Echo - Smart Voice Assistant - Smartify Store
Tips for creating user friendly voice assistant apps, by Michael Gearon
Alexa Dot - Voice-Controlled Home Assistant with Wireless Streaming – Shop Delight