Root user
Also referred to as the account owner or account root user. As the root user, you have
complete access to all AWS services and resources in your AWS account. When you first
create an AWS account, you begin with a single sign-in identity that has complete access
to all AWS services and resources in the account. This identity is the AWS account
root user. You can sign in as the root user using the email address and password that you used to
create the account. Root users sign in with the AWS Management Console
Important
When you create an AWS account, you begin with one sign-in identity that has complete access to all AWS services and resources in the account. This identity is called the AWS account root user and is accessed by signing in with the email address and password that you used to create the account. We strongly recommend that you don't use the root user for your everyday tasks. Safeguard your root user credentials and use them to perform the tasks that only the root user can perform. For the complete list of tasks that require you to sign in as the root user, see Tasks that require root user credentials in the IAM User Guide.
For more information about IAM identities including the root user, see IAM Identities (users, user groups, and roles).