APC, which stands for Alternative PHP Cache, is a framework used for caching the compiled source code of a given script application, which could boost a database-driven Internet site several times. Every time a PHP web page is accessed, the script pulls the site content which has to be loaded from a database, parses and compiles the program code, then the result is displayed to the website visitor. While this is necessary for websites with regularly changing content, it is a total waste of processing time and resources for a site which doesn't change, like an informational portal that displays identical content at all times. When the web pages for such a site are compiled, APC caches them and delivers them every time a user accesses them. As this saves the time to request content from the database and to parse and compile the code, the Internet site will load a lot faster. APC is very effective especially for scripts with massive source code.