Application pools in IIS

Application pools in IIS

An application pool is a group of one or more URLs that are served by a worker process or a set of worker processes. Application pools set boundaries for the applications they contain, which means that any applications that are running outside a given application pool cannot affect the applications in the application pool.

Application pools offer the following benefits:

• Improved server and application performance. You can assign resource-intensive applications to their own application pools so that the performance of other applications does not decrease.
  
• Improved application availability. If an application in one application pool fails, applications in other application pools are not affected.
  
• Improved security. By isolating applications, you reduce the chance that one application will access the resources of another application.