Hi,
I assume you are referring to Standard S2 SKU and Scale out (App service plan). If my assumption is incorrect please let me know.
If you Scale out to 2, that means you will have two separate instances running, each having 2 vCPUs, 3.5GB RAM, and access to shared storage limited to 50GB. Incoming requests for your application will be load-balanced across the two instances.
If your application needs access to more vCPUs/RAM then you would need to Scale up to a larger SKU, such as Standard S3, which has 4 vCPUs and 7GB RAM for each instance.
Please click Accept Answer if the above was useful.
Thanks.
-TP