Alternative PHP Cache, or APC, is a module for Apache web servers which is used to cache the output code of script apps. It is very effective for scripts with large source code and could speed up such a site up to 3 times. PHP websites are dynamic and any time a user opens a page, the script connects to a database to get some content, after that the code is parsed and compiled before it is displayed to the site visitor. In case the output code does not change however, that is the case with Internet sites that display the exact same content all the time, these actions trigger unnecessary reading and writing. What APC does is that it caches the previously compiled code and delivers it every time visitors browse a site, so the database doesn't need to be accessed and the program code doesn't have to be parsed and compiled over and over again, that in turn decreases the website loading time. The module can be pretty useful for informational Internet sites, blogs, portfolios, and many others.