Related: AWS
An ARN stands for Amazon Resource Name. It is a unique identifier which is assigned to a resource in AWS. An ARN is composed off the account number, type of resource, and the name of the resource, although the specific format depends on the type of resource.
Below is an example ARN for a VPC, this is a region bound resource and therefore it’s region is included in the ARN.
arn:aws:ec2:us-east-1:123456789012:vpc/vpc-0e9801d129EXAMPLE
Below is an example ARN for a user. A user is global and therefore not region bound, this is why it is omitted from the ARN.
arn:aws:iam::123456789012:user/johndoe