A solution to the directory structure of CodeIgniter

Source: Internet
Author: User
Tags codeigniter
About the directory structure of CodeIgniter
Younger brother is currently learning CI framework, I found inside the application and system directory under the core, helpers, language, libraries these four directories, and the appliction under the few directories are almost empty, Look at the document know, loading is the first from the appliction below, if not go to the system under the search.
I don't understand why I have to add these directories under the application. Isn't that a significant nuisance?

------Solution--------------------
This is for you to write extensions. Extensions of the same name cover the core classes and libraries.
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