The web.config file is a subset of the machine.config file.
If the application contains child directories, it can define a web.config file for each folder. Scope of each configuration file is determined in a hierarchical top-down manner.
Any web.config file can locally extend, restrict or override any settings defined on the upper level.
Visual Studio generates a default web.config file for each project. An application can run without a web.config file, however, you cannot debug an application without a web.config file.
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