As you can see, the only mandatory resources for a module is the directory name in which it lives and a ModuleConfig.cfc. The module developer can choose to implement a simple module or a very complex module. All folders are optional and only what is used will be loaded. Not only are modules reusable and extensible, but you can easily create a module with dual functionality: A standalone application or a module. This is true reusability and flexibility. I don't know about you, but this is really exciting (Geek Alert!).