Whats the difference between Application Pools and Web Sites in IIS ?

From a SharePoint point of view, both are created by a SharePoint Admin, through Central Admin or PowerShell.

An IIS site is equal to a SharePoint web application. Each web application must run within a single application pool. However, an application pool can host several web applications.

An application pool represents a w3wp.exe process running on the server (you can see it in Task Manager). It provides a process where the IIS sites (web apps) that use it can execute server side code and respond to user requests.

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