.NET: What is an Application Domain?

In past only "Processes" were used to define boundaries and provide security. Every process had its own virtual memory and never overlaps the other process virtual memory. Thus one process cannot crash another process. This way, any problem or error in one process does not affect the other processes.
In .Net they introduced application "Domains" and went a step ahead of process. This makes multiple applications to run without influencing each other. If one application domain throws an error it does not affect the other application domains.

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