You only need to expose the load balancer to the outside world. The load balancer then forwards requests to the EC2 instances or other services behind it. AWS provides different load balancers. Application load Balancer supports HTTP and HTTPS protocols.
ALB consists of these parts
- Load balancer
- Listener - it links to a target group. It sets up rules based on the port, protocol, query string etc to decide which target group to send
- Target Group - it defines your group of backends
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