Alternative PHP Cache, or APC, is a module for Apache servers that is employed to cache the output code of script apps. It is very effective for scripts with large source code and could accelerate such a website up to three times. PHP sites are dynamic and any time a website visitor opens a page, the script connects to a database to retrieve some content, and then the code is parsed and compiled before it's displayed to the site visitor. In case the output code doesn't change however, that's the case with sites which display the very same content at all times, these actions trigger unnecessary reading and writing. What APC does is that it caches the previously compiled code and delivers it whenever visitors browse an Internet site, so the database does not need to be accessed and the program code doesn't have to be parsed and compiled continuously, that in turn reduces the site loading time. The module can be quite effective for informational Internet sites, blogs, portfolios, etcetera.