It obtain the aws identity of the instance role or credentials
OK
AccountID is the unique identifier for the AWS account
"123456789012"
ARN is the Amazon Resource Name that uniquely identifies the IAM user
"arn:aws:iam::123456789012:user/johndoe"
UserID is the unique identifier for the IAM user
"AIDACKCEVSQ6C2EXAMPLE"
Region is the AWS region where the IAM user is operating
"us-west-2"