What is the use of app registration in azure

 1. Apps Register in Azure AD  provide you Application Id and Redirect URI value that Independent Software Vendor can use in their client application authentication code.

2. Using App Registration we can generate the token and authenticate the application.

3. If we want to use Azure Active Directories capabilities we must register the App.

4. Once you create App Registration you will get client ID and Secret Key and you can also provide the permission as well from app Registration.