Federated identity is a process where a user's identity and attributes are stored across different identity management systems. For example, we can use federated identity to allow users to log in to our system with another identity provider's credentials. In this recipe, we will see how to use federated identity with Cognito user pools. For the purpose of demonstration, we will be using Google Plus as the identity provider and Cognito will act as the identity broker. The general process will be the same for any other providers, such as Facebook or Amazon.