APC, which is an acronym for Alternative PHP Cache, is a framework used for caching the compiled source code of a script application, that can boost a database-driven Internet site several times. Any time a PHP web page is accessed, the script pulls the site content which has to be shown from a database, parses and compiles the program code, and the result is shown to the visitor. While this is necessary for sites with regularly changing content, it's a complete waste of processing time and system resources for a website which does not change, for example an informational portal that displays identical content on a regular basis. Once the webpages for such a website are compiled, APC caches them and delivers them any time a website visitor opens them. Since this saves the time to request content from the database and to parse and compile the code, your Internet site will load much quicker. APC is very effective particularly for scripts with larger source code.