What happens when we first boot our app using Ember JS?

I am new to ember and I have been through the Ember JS Documentation for a while and suddenly struck with two questions. I even surfed on the Internet for hours and barely could find a solution. So, here are they:

Question 1:

Quoting Ember Documentation,

The application is entered when your app first boots up. Just like any other route, it will load an application template by default.

application in the above quote represents the application route which according to the doc is loadedwhen app boots and renders the application.hbs. Where is the application route situated?

Question 2:

Where exactly in the control flow does the router.js file get loaded? Before application route or after application route?

Request:

Also I would be thankful if anyone could assist me with the complete flow of the Ember JS (starting when the user enters localhost:4200).

Thanks.