# Welcome


## AWS SignIn Control Plane


With AWS Sign-In, you can access AWS resources using an AWS Builder ID, or as a root user, IAM user, user in IAM Identity Center, or federated user. For more information about how to sign in to AWS depending on your user type, see [What is AWS Sign-In?](/signin/latest/userguide/what-is-sign-in.html). 

This guide provides information about API actions for identity-aware sessions. For more information, see [Enabling identity-aware console sessions](/singlesignon/latest/userguide/awsapps.html#identity-aware-sessions).

**Note**  
 AWS Sign-In uses the `signin` namespace.

## AWS Sign-In Data Plane


The AWS Sign-In Data Plane implements OAuth 2.0 flows for AWS CLI authentication, providing secure token exchange and refresh capabilities.

**Note**  
 AWS Sign-In Data Plane uses the `signin` namespace.