CodeIgniter is based on the Model-View-Controller (MVC) development pattern. MVC is a software approach that separates application logic from presentation. In practice, it permits web pages to contain minimal scripting since the presentation is separate from the PHP scripting.

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Model: The Model represents data structures. Typically model classes will contain functions that help to retrieve, insert, and update information in database.

View: The View is the information that is being presented to a user. A View will normally be a web page, but in CodeIgniter, a view can also be a page fragment like a header or footer. It can also be an RSS page, or any other type of "page".

Controller: The Controller serves as an intermediary between the Model and the View, and any other resources needed to process the HTTP request and generate a web page.

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Helper files are a collection of functions in a particular group. Helpers can be used within Models, Controller and View files.

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Plug-ins work almost identically to helper. A plug-in usually provides a single function, plug-ins are intended to be created and shared by community.

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$this->load->plugin(plugin name);$this->load->helper (file name of the helper);