Alternative PHP Cache, or APC, is a module for Apache web servers that is used to cache the output code of script applications. It is very efficient for scripts with large source code and will accelerate such a site up to three times. PHP sites are dynamic and each time a user opens a page, the script connects to a database in order to get some content, after that the code is parsed and compiled before it's shown to the site visitor. In case the output code does not change however, that is the case with Internet sites which show the very same content at all times, these actions trigger unneeded reading and writing. What APC does is that it caches the already compiled program code and delivers it whenever visitors browse an Internet site, so the database doesn't have to be accessed and the code does not need to be parsed and compiled again and again, which consequently reduces the website loading time. The module could be extremely helpful for informational sites, blogs, portfolios, etc.