How ALEXA works? Which is made by Amazon company - classy colour

Alexa is a small computer which is  obey your order or your tasks like playing music 🎶, time 🕒, weather ☁, & other certain things.. 

But but but !!!
The reality behind Alexa isn't it.  Alexa haven't own brain (in terms of computer)

 
Alexa is wake word for amazon echo. 

Whatever you say to echo is sent to amazon.

They process the voice of AVS [ alexa voice service ]
It is convert the recording into commands that is interprets.

Below video which is help to understand how it's work. Thanks coders.eduyear for this video..