I’m currently diving into AWS and getting a handle on the various costs involved, especially when it comes to data transfer within a VPC. I have a setup with several EC2 instances that need to communicate with each other for our applications to function effectively.

Could anyone help clarify how the charges work for data transfer between these instances? It seems like they should be free since they’re in the same VPC, but I’ve heard there might be hidden costs depending on the type of instances or data transfer methods used. Additionally, if we had an Auto Scaling group that spins up new instances, would that affect the costs too?

I’d really appreciate any insights or experiences you have regarding how AWS handles these charges. Thank you!