When you create an AWS account, you sign in with the email address and password you used to sign up. That identity is the root user, and it has complete, unrestricted access to every resource and setting in the account, including billing and the ability to close the account. Permissions policies cannot limit the root user of a standalone account. Because it is so powerful, protecting it is one of the first things AWS asks you to do, and questions about it appear regularly on the Cloud Practitioner exam.
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