Q:
What is IIS App pool identity versus impersonate identity?
A:
Using impersonation in the web.config allows you to override whatever identity was configured for the Application Pool the app is running under – it’s just a more fine grained method to control identity ( on the app level vs. the ApplicationPool level), so you could have two apps run on the same AppPool, but one of them uses impersonation to use another identity.
Resources:
https://stackoverflow.com/questions/5046420/app-pool-identity-versus-impersonation-identity
