What is an IIS application pool

Question

What exactly is an application pool   What is its purpose

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Application pools are used to separate sets of IIS worker processes that share the same configuration and application boundaries.

Application pools used to isolate our web application for better security, reliability, and availability and performance and keep running without impacting each other . The worker process serves as the process boundary that separates each application pool so that when one worker process or application is having an issue or recycles, other applications or worker processes are not affected. One Application Pool can have multiple worker process Also.

Or we can simply say that, An application pool is a group of one or more URLs that are served by a worker process or set of worker processes. Any Web directory or virtual directory can be assigned to an application pool. So that one website cannot be affected by other, if u used separated application pool.

Source : Interviewwiz

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An Application pool is a collection of applications which uses the same worker process of IIS  w3wp exe   Primary concern of using Application pool is to isolate two different applications with different security concerns and also to avoid crashing of applications due to worker process death

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application pool provides isolation for your application  and increase the availability of your application because each pool run in its own process so an error in one app won t cause other application pool  And we have shared pool that hosts several web applications running under it and dedicated pool that has single application running on it

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An application pool is like a pond  if I create 2 application pools  first application pool has 100 fishes and another application pool has 200 fishes  here fish is like an application in application pool  They are managed by worker processes  Best advantage is  if  pound number-1 has bad water and cases all fish are effected then there is security of fish in pound number-2  Like this if any application pool is effected by any problem but there is not any effect of this problem in application pool 2 so security in improve  and another profit is that is you provide all necessary authentication and rights to all applications in a single application pool

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Assume scenario where swimmers swim in swimming pool in the areas reserved for them what happens if swimmers swim other than the areas reserved for them the whole thing would become mess similarly iis uses application pools to seperate one process from another

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An application pool is a group of one or more URLs that are served by a worker process or set of worker processes  Application pools are used to separate sets of IIS worker processes that share the same configuration and application boundaries

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Application pools are used to separate set of IIS worker processes that share the same configuration   Application pools enable us to isolate our web application for better security  reliability  and availability

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An application pool is a group of one or more URLs that are served by a worker process or set of worker processes  Any Web directory or virtual directory can be assigned to an application pool   Every application within an application pool shares the same worker process

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IIS-Internet information Service is a web server used to host one or more web application   Lets take any example here say Microsoft is maintaining web server and we are running our website  abc com  news content based on this IIS  Since  Microsoft is a big shot company it might take or also ready to host another website say xyz com ecommerce based    Now web server is hosting i e providing memory to run both websites on its single web server Thus   here application pools come into picture   abc com has its own rules  business logic   data etc and same applies to xyz com   IIS provides two application pools  path  to run two websites in their own world  data  smoothly in a single webserver without affecting each ones matter  security  scalability  This is application pool in IIS   So you can have any number of application pool depending upon on servers capacity

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An application pool is a group of urls served by worker processors or set of worker processors    There can exist any number of application pools    In IIS it is possible to create more than one application pool   An application in different application pool runs in different worker processors   Advantage  If an error occurred in one application pool will not effect the applications running in another application pool

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An application pool is a group of one or more URLs that are served by a worker process or set of worker processes  Application pools are used to separate sets of IIS worker processes that share the same configuration and application boundaries  Application pools are used to isolate our web application for better security  reliability  availability and performance  and they keep running without impacting each other

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The application Pools element contains configuration settings for all application pools running on your IIS  An application pool defines a group of one or more worker processes  configured with common settings that serve requests to one or more applications that are assigned to that application pool   Because application pools allow a set of Web applications to share one or more similarly configured worker processes  they provide a convenient way to isolate a set of Web applications from other Web applications on the server computer   Process boundaries separate each worker process  therefore  application problems in one application pool do not affect Web sites or applications in other application pools  Application pools significantly increase both the reliability and manageability of your Web infrastructure

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I second the top voted answer  but feel like adding little more details here if anyone finds it useful  short version   IIS runs any website you configure in a process named w3wp exe  IIS Application pool is feature in IIS which allows each website or a part of it to run under a corresponding w3wp exe process  So you can run 100 websites all in a single w3wp exe or 100 different w3wp exe  E g  run 3 websites in same application pool same w3wp exe  to save memory usage   run 2 different websites in two different application pools so that each can run under separate user account called application pool identity   run a website in one application pool and a subsite  website app  under a different application pool   Longer version  Every website or a part of the website you can run under an application pool You can control some basic settings of the website using an application pool   You would like the website to run under a different w3wp exe process Then create a new application pool and assign that to the website  You would like to run the website and all it s code under a different user account e g under Admin privileges  you can run do that by changing Application Pool Identity  You would like to run a particular application under  net framework 4 0 or 2 0  You would like to make sure the website in 32 bit mode or have a scheduled recycle of the w3wp exe process etc All such things are controlled from iis application pool

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Basically  an application pool is a way to create compartments in a web server through process boundaries  and route sets of URLs to each of these compartments  See more info here  http   technet microsoft com en-us library cc735247 WS 10  aspx

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Application pools allow you to isolate your applications from one another  even if they are running on the same server   This way  if there is an error in one app  it won t take down other applications   Additionally  applications pools allow you to separate different apps which require different levels of security   Here s a good resource  IIS and ASP NET  The Application Pool

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