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What is Application Pools in IIS ?

An Application Pool can contain one or more web applications. In IIS it is possible to create one or more application pools. Applications in different application pools, runs in its own worker process(w3wp.exe). Errors in one application pool will not affect the applications running in other application pools. For example, if an application pool is recycled, only the applications in that pool are affected(may loose state information if stored inside worker process), and applications in other application pools are unaffected. Deploying applications to different application pools enables us to achieve the degree of application isolation that we need, in terms of availability and security. For example, applications that require high security can be present in one application pool, and the other applications can be in a different application pool. Another example, hosting providers can place competing business applications in different application pools, so that they do not accidentally access the data belonging to their competitor. 

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