AWS provides an Elastic Load Balancer (ELB) as a service. AWS has two kinds of ELB:
- Classic ELB
- Application Load Balancer
A Classic ELB can forward requests to one set of EC2 instances and an Application Load Balancer can forward requests to applications based on the application content/path/host. Classic load balancer can handle load for both layer 4 and layer 7. Application load balancer can handle load for only layer 7 protocol.