The target group port is the default port if you register the target (e.g. an instance ID) without specifying the port.
A brief description is available here: https://docs.aws.amazon.com/cli/latest/reference/elbv2/register-targets.html
By default, the load balancer routes requests to registered targets using the protocol and port for the target group. Alternatively, you can override the port for a target when you register it. You can register each EC2 instance or IP address with the same target group multiple times using different ports.
The Target group port defines the port on which instances receive traffic from Load Balancer and also the port on which health checks are performed (unless the health check port is overridden)
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