Using the AWS account root user
When you create an AWS account, you begin with one sign-in identity called the AWS account root user that has complete access to all AWS services and resources. We strongly recommend that you don't use the root user for everyday tasks. For tasks that require root user credentials, see Tasks that require root user credentials in the IAM User Guide.
Important
Anyone who has root user credentials for your AWS account has unrestricted access to all the resources in your account, including billing information.
You can change, or reset the root user password, and create, or delete access keys (access key IDs and secret access keys) for your root user. For help signing in using your root user, see Sign in to the AWS Management Console as the root user in the AWS Sign-In User Guide.