Alternative PHP Cache, or APC, is a module for Apache web servers which is used to cache the output code of script applications. It is very effective for scripts with large source code and can boost such a website up to three times. PHP websites are dynamic and each time a website visitor opens some web page, the script connects to a database in order to retrieve some content, then the code is parsed and compiled before it's displayed to the visitor. In case the output code does not change however, which is the case with Internet sites which display identical content all the time, these actions result in needless reading and writing. What APC does is that it caches the already compiled program code and delivers it each time visitors browse a website, so the database does not need to be accessed and the program code does not have to be parsed and compiled again and again, that in turn reduces the website loading time. The module could be extremely effective for informational sites, blogs, portfolios, etc.