Router can be used to parse urls into arrays containing indexes for the controller, action, and any parameters, and the opposite: to convert url arrays (eg. array(‘controller’=>’posts’, ‘action’=>’index’)) to string urls.
Read more about ways to configure the Router here: https://book.cakephp.org/1.3/en/The-Manual/Developing-with-CakePHP/Configuration.html#routes-configuration
Router also include other utility methods for dealing with urls.