This code defines an elb resource in the AWS namespace. The aws_elb resource has the following attributes:
Description: A descriptive name for the elb resource.
Type: AWS ELB
Provider: Amazon Web Services
Availability Zone: us-east-1a
Security Group: <none>
Inbound Traffic: <none>
Outbound Traffic: <none>
This elb resource has an instance with the identifier 123456789012.