What is exactly is an Application Domain (AppDomain) and how is it different than a process or thread?
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1Possible duplicate of [I don't understand Application Domains](http://stackoverflow.com/questions/622516/i-dont-understand-application-domains) – Ian Goldby Nov 17 '15 at 09:13
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See MSDN.
Application domains provide a more secure and versatile unit of processing that the common language runtime can use to provide isolation between applications. You can run several application domains in a single process with the same level of isolation that would exist in separate processes, but without incurring the additional overhead of making cross-process calls or switching between processes. The ability to run multiple applications within a single process dramatically increases server scalability.
An AppDomain is basically an isolated execution environment for managed code.
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1+1 Think of it as a "lightweight process" and you'll usually be close enough. – No Refunds No Returns Mar 03 '10 at 03:50
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An application domain is the "space" segments of code can run in. It can be used for a couple of things such as creating a sandbox when loading assemblies that you don't fully trust. It's different than a thread/process in that it houses the code that is being executed instead of actually being executed code. In a broad sense you can think of any application as an application domain.
