Definition
An IAM user represents an identity within a cloud computing environment, such as AWS or Azure, that can be granted specific permissions to access cloud resources. It is essentially a digital persona assigned to a person or application needing to interact with cloud services. This user identity is configured with credentials, like passwords or access keys, which are used to authenticate requests to the cloud provider. In practice, IAM users enable granular control over who can do what within your cloud infrastructure, ensuring that only authorized entities access sensitive data or perform critical operations. This is vital for maintaining security, enforcing the principle of least privilege, and auditing access activities. For instance, a developer might have an IAM user with permissions to deploy applications but not to delete production databases. Unlike a root account which has unlimited privileges, an IAM user's permissions are intentionally limited to reduce the blast radius of potential security incidents. Understanding IAM users is fundamental for cloud security certifications like CCSP and AWS exams.