Uses of Zend_Controller Gives the request & reponse methods by using its sub-classes. $request = new Zend_Controller_Request_Http() $response = new Zend_Controller_Response_Http() Uses of Zend_Date Date related processing can be done using this component. Uses of Zend_File_Transfer it provides extensive support for file uploads and downloads. Uses of Zend_Db It is used to doing database related purpose in our appication. Uses of Zend_Paginator Doing the pagination in our application. Uses of Zend_Auth It is used to authenticate a user. $auth = Zend_Auth::getInstance(); $results = $auth->authenticate($adapter); if ($results->isValid()){ /* user successfully authenticate into login process */ } Zend_Session_Namespace This is a simple proxy class to use API into the Zend_Session managed $_SESSION Superglobal.