There are several components that make up the Microsoft identity platform: OAuth 2.0 and OpenID Connect standard-compliant authentication service Application management portal: A registration and configuration experience in the Azure portal, along with the other Azure management capabilities. You register an application using the App registrations experience in the Azure portal so that your app can be integrated with the Microsoft identity platform and call Microsoft Graph. Reference: https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-overview https://docs.microsoft.com/en-us/graph/auth-register-app-v2