Answer
AppDomains provided isolation but were heavy and difficult to unload.
.NET Core replaced them with AssemblyLoadContext.
Quick Answer
AppDomains in .NET Framework let you load and unload assemblies independently within one process. They were removed in .NET Core because they were expensive, rarely used correctly, and did not work cross-platform. AssemblyLoadContext is the lightweight replacement for plugin and isolated assembly loading scenarios.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ