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 can accelerate such a site as much as 3 times. PHP sites are dynamic and every time a website visitor accesses some page, the script hooks up to a database to retrieve some content, then the code is parsed and compiled before it's shown to the guest. If the output code does not change however, that is the case with sites that display the very same content all the time, these actions trigger excessive 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 doesn't need to be accessed and the program code does not need to be parsed and compiled again and again, which consequently lowers the site loading time. The module can be rather effective for informational sites, blogs, portfolios, and so on.