Realm provides many authentication providers to log users into your app. Each provider creates a unique user identity. Realm lets you merge multiple credentials into one user identity.
Consider an application that offers anonymous login. This allows users to explore the app without
registering. If users like the application, they create permanent
accounts. They sign up with SSO or email/password authentication. By default,
this creates a new
User object. The app must link the new
identity with the original User.
You can link identities using
links authentication providers to a logged-in