The URL loads the app by entering the URL in the address bar and user will click a link within
the app. The Ember uses the router to map the URL to a route handler. The router matches
the existing URL to the route which is then used for loading data, displaying the templates
and setting up an application state.
The Route handler performs the following actions:
1. It provides the template.
2. It defines the model that will be accessible to the template.
3. If there is no permission for the user to visit a particular part of the app, then the router will redirect to a new route.
