What is Amazon Alexa?
user
Alexa is a virtual assistant that uses artificial intelligence to help you do things. It can listen to you, read your messages, respond to questions, control devices, and provide information.
assistant
What is Amazon Alexa?
user
It’s a virtual assistant, or “chatbot”. I can give you more details, like the description on their website:

https://www.amazon.com/b?ie=UTF8&node=582281011
assistant
What is Amazon Alexa?