Creating an AWS account also creates a root user. The email address and password supplied at the time of creating the AWS account become the username and password for the root user. This combination of an email address and password is called the root account credentials.
The root account (that is, the root user) has complete, unrestricted access to all resources on the account, including billing information. This account is a superuser and its permissions cannot be altered by any other user on the account.
Since the root account has unrestricted access to all the resources on the account, it is highly recommended that you avoid using the root account for day-to-day activities. On a newly created AWS account, it is recommended that you create individual IAM users based on organizational needs and assign them the required permissions. These non-root...