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Hi Mahnoor,
Thank you for submitting your question. I’ll do my best to clarify this item for you.
In this item’s explanation, we only mentioned that the ELBs are directing traffic (or routing traffic in other terms) to a minimum number of instances, which is the primary purpose of using an ELB -> elasticity.
We did not mention in the explanation that the ELB was scaling the backend instances.
Please see the first paragraph of this reference for AWS Elastic Load Balancer for further information: https://docs.aws.amazon.com/elasticloadbalancing/latest/userguide/how-elastic-load-balancing-works.html
Regards,
Adrian Formaran @ Tutorials Dojo