Alexa App is needed because without it you can’t give a command to Alexa to give you answers to your questions. So, first, you have to download Alexa app, Alexa setup, Alexa.amazon.com. How to set up Alexa for Echo?
For Alexa setup, do Alexa login and add information like name, location, language. After done the Alexa app setup, it will help the Alexa app to recognize you. Amazon Alexa app helps to control home devices like lights, fans, microwaves, etc. Alexa app has a lot of features to use.
Also, know steps to connect Echo to wifi, Echo setup, echo dot setup, Alexa dot setup, etc. Amazon Echo dot is famous nowadays due to its skills and cost.