The asp.net application folder is contains list of specified folder that you can use of specific type of files or content in an each folder. The root folder structure is as following
- BIN
- App_Code
- App_GlobalResources
- App_LocalResources
- App_WebReferences
- App_Data
- App_Browsers
- App_Themes
Bin Directory
It is contains all the precompiled .Net assemblies like DLLs that the purpose of application uses.
App_Code Directory
It is contains source code files like .cs or .vb that are dynamically compiled for use in your application. These source code files are usually separate components or a data access library
App_GlobalResources Directory
It is contains to stores global resources that are accessible to every page.
App_LocalResources Directory
It is serves the same purpose as app_globalresources, exept these resources are accessible for their dedicated page only
App_WebReferences Directory
It is stores reference to web services that the web application uses.
App_Data Directory
It is reserved for data storage and also mdf files, xml file and so on.
App_Browsers Directory
It is contains browser definitions stored in xml files. These xml files define the capabilities of client side browsers for different rendering actions.
App_Themes Directory
It is contains collection of files like .skin and .css files that used to application look and feel appearance.
Thank you.