Echo can best be described as a speech-driven personal assistant with 360-degree micophone. The device is continuously on standby and in contact with Amazon Cloud Servers. Activate it by using a code word, in this case 'Alexa', and then asking your question or giving your command.
Amazon Echo was the first on the market. Echo shows an insight about how we will use computers in the future because it is completely hands-free and you can use it anywhere. It is optimized for hands-free because it has a sensitive microphone that can detect your voice anywhere in a large room and a speaker system that lets users listen from anywhere in the room to the Echo.
The current version has no screen and camera so the number of functions is limited. On the other hand It is already operational in America and affordable.