Answer: Cognito Sync

Overall explanation Correct option: Cognito Sync Amazon Cognito Sync is an AWS service and client library that enables cross-device syncing of application-related user data. You can use it to synchronize user profile data across mobile devices and the web without requiring your own backend. The client libraries cache data locally so your app can read and write data regardless of device connectivity status. When the device is online, you can synchronize data, and if you set up push sync, notify other devices immediately that an update is available. Incorrect options: Cognito Identity Pools - You can use Identity pools to grant your users access to other AWS services. With an identity pool, your users can obtain temporary AWS credentials to access AWS services, such as Amazon S3 and DynamoDB. Identity pools support anonymous guest users, as well as the specific identity providers that you can use to authenticate users for identity pools. Cognito User Pools - A Cognito user pool is a user directory in Amazon Cognito. With a user pool, your users can sign in to your web or mobile app through Amazon Cognito, or federate through a third-party identity provider (IdP). Whether your users sign-in directly or through a third party, all members of the user pool have a directory profile that you can access through an SDK.

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