Alternative PHP Cache, or APC, is a module for Apache servers which is used to cache the output code of script apps. It is very useful for scripts with large source code and will accelerate such a site up to 3 times. PHP websites are dynamic and whenever a website visitor accesses a page, the script hooks up to a database in order to get some content, then the code is parsed and compiled before it's displayed to the site visitor. If the output code does not change however, that's the case with Internet sites that display the same content at all times, these actions trigger needless reading and writing. What APC does is that it caches the already compiled code and delivers it every time visitors browse a website, so the database does not need to be accessed and the code does not need to be parsed and compiled over and over again, that in turn lowers the Internet site loading time. The module can be really useful for informational Internet sites, blogs, portfolios, etcetera.