Angular routing vs Ionic routing

Edit:

Ionic 4 is also using standard angular routes in the background.Pushing and popping is not the ionic way anymore and here is a good read on using angular router with ionic.

Original Answer:

Ionic does not support URL routes, instead it implements a custom navigation solution - NavController (as linked by suraj). NavController maintains a stack of pages - moving forward you push a page to the stack this.nav.push(Page1); and moving back you pop it this.navCtrl.pop();. In this way your url in browser is always the same and application always opens on the home page - which is similar to mobile application behaviour. To enable direct access to a certain resource (as you would open url myapp/items/1) you have to use deep linking plugin.

In ionic, we push a view screen from another views

But in angular it is predefined routes mapping that if you go to this route i.e. app/login you will be redirected to login route that is bind with loginComponent