Definition
An IAM role is a virtual identity in cloud environments that grants specific permissions to cloud resources or users. It functions as a temporary credential, allowing an entity to assume the role and act with its associated privileges without needing to manage long-term access keys. Understanding IAM roles is crucial for implementing the principle of least privilege, ensuring that only necessary access is granted to prevent security breaches. For example, a web server might assume an IAM role to read objects from a specific S3 bucket, rather than having static credentials embedded within its configuration. Unlike a user, a role is not associated with a specific person or application but rather with a set of permissions that can be assumed by various entities. This concept is fundamental in cloud security domains and appears on exams like the AWS Certified Solutions Architect Associate and the (ISC)² CCSP.