One of the nice things about Drupal is its pluggable caching system. It allows site owners to choose from a vast array of caching backends, such as memcache, APC, files, as well as others.
The memcache module is one of the most popular of these modules, providing Drupal integration with memcached, and in-memory distributed object caching daemon.
All Drupal pluggable caching modules work by providing a caching .inc file that is added in the settings.php for the site like this:
$conf['cache_inc'] = './sites/all/modules/memcache/memcache.inc';
Because of this pluggability, you can can effectively extend the caching in creative ways.
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