# CodeIgniter User Guide Version 1.5.4

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# Using CodeIgniter Libraries

All of the available libraries are located in your system/libraries folder. In most cases, to use one of these classes involves initializing it within a controller using the following initialization function:

`$this->load->library('class name');`

Where class name is the name of the class you want to invoke. For example, to load the validation class you would do this:

`$this->load->library('validation');`

Once initialized you can use it as indicated in the user guide page corresponding to that class.

## Creating Your Own Libraries

Please read the section of the user guide that discusses how to create your own libraries