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 boost such an Internet site as much as three times. PHP sites are dynamic and any time a user opens a web page, the script links to a database in order to retrieve some content, and then the code is parsed and compiled before it's displayed to the guest. In case the output code doesn't change however, which is the case with sites which show identical content all of the time, such actions result in excessive reading and writing. What APC does is that it caches the previously compiled code and delivers it whenever visitors browse a site, so the database doesn't have to be accessed and the code doesn't need to be parsed and compiled continuously, that in turn lowers the website loading time. The module could be very helpful for informational websites, blogs, portfolios, etcetera.