Alternative PHP Cache, or APC, is a module for Apache servers that is used to cache the output code of script apps. It is very efficient for scripts with large source code and can speed up such a website as much as three times. PHP sites are dynamic and every time a website visitor accesses a webpage, the script connects to a database to retrieve some content, then the code is parsed and compiled prior to it being displayed to the site visitor. In case the output code doesn't change however, that's the case with websites that display the very same content all of the time, these actions result in excessive reading and writing. What APC does is that it caches the already compiled program code and delivers it each time visitors browse an Internet site, so the database does not need to be accessed and the code does not have to be parsed and compiled continuously, that consequently lowers the site loading time. The module could be rather efficient for informational sites, blogs, portfolios, etcetera.