Listener. Listens on a specific port (e.g., 80) and protocol (e.g., HTTP).

Listener rule. Takes requests that come into a listener and sends those that match specific paths (e.g., /foo and /bar) or hostnames (e.g., foo.example.com and bar.example.com) to specific target groups.

Target groups. One or more servers that receive requests from the load balancer. The target group also performs health checks on these servers and sends requests only to healthy nodes.