How Does Yii Cache Works?

Hi Guys,

Recently I was researching options to enhance Yii application performance and came across Yii's cache mechanism.

Can anyone please explain me how does this actially works?

I have used Memcache key-value store,

array(
    ......
    'components'=>array(
        ......
        'cache'=>array(
            'class'=>'system.caching.CMemCache',
            'servers'=>array(
                array('host'=>'server1', 'port'=>11211, 'weight'=>60),
                array('host'=>'server2', 'port'=>11211, 'weight'=>40),
            ),
        ),
    ),
);

I am willing to implement this feature for one of my legacy non Yii (vanilla PHP app).