ARN stands for Amazon Resource Name in AWS. It is a unique identifier assigned to an AWS resource, used to specify and unambiguously reference a resource across all of AWS. ARNs follow a standardized format that includes components such as partition, service, region, account ID, and resource identifier. They are extensively used in IAM policies, API calls, and AWS service configurations to precisely identify resources like EC2 instances, S3 buckets, Lambda functions, and more.
