Using Auth0 in your applications means that you will be "outsourcing" the authentication process to a centralized login page in the same way that Gmail, YouTube, and any other Google property redirects to accounts.google.com whenever a user signs in.
Your user will authenticate, and Auth0 will generate an ID Token that will be passed back to your application.
In a native/mobile application, the default experience will open a SafariViewController in iOS or a Custom Chrome Tab in Android.
For security in native/mobile devices, Auth0 uses the Mobile Login Flow.
While we strongly recommend that you use our hosted universal login page, if you prefer to embed your own login pages within your native/mobile app, you can implement our login widget (Lock UI) directly into your app with our:
Step-by-step instructions for tasks