What is an application domain?

Answer

Application Domain is designed as a security boundary that confines errors and faults to a specific domain.

The basic theory was that each running application was loaded into a separate process that automatically isolated each application from others. If for example, an error occurred in a single application, that wouldn't affect the others running on the system. Essentially, a process defined a security boundary that also prevented applications from talking directly with each other. This actually worked quite well and helped to solve the perpetual tug of war that existed between scalability and fault tolerant systems. With the advent of the .NET runtime this concept was enhanced to include a new type of entity called the Application Domain.

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