What is Application Pools?

Application Pools are a fundamental concept in web servers like Internet Information Services (IIS). They are used to isolate web applications from each other, providing enhanced security and reliability. Each application pool runs in its own worker process, meaning that if one application crashes, it doesn't affect other applications running in separate pools. They also allow for different applications to run under different security contexts, and support for different versions of the .NET framework or other technologies. They are commonly used to host websites and web services, enabling administrators to manage resources and isolate applications for improved stability and security.