IIS App

Site

• Container for application and virtual directory.
• Binding protocol : protocol communication between server and client. (HTTP / HTTPS)
• Binding Information : combination IP address, port and optional host header.

Application

• Run inside that 'folder'.
• Standalone application. Own Session state and Application State.
• Can run in different App Pool with different .NET version.

Virtual Directory

• Link to a physical folder on the server
• Point to different phyical path into that application. (e.g. image folder)
• only run in DefaultAppPool