model($model[, $name = ''[, $db_conn = FALSE]]) 
Parameters:
$model (mixed) – Model name or an array containing multiple models 
$name (string) – Optional object name to assign the model to 
$db_conn (string) – Optional database configuration group to load  Returns:
CI_Loader instance (method chaining)  Return type:
CI_Loader  
$this->load->model('model_name');
If your model is located in a subdirectory, include the relative path from your models directory. For example, if you hav