APC, which is an acronym for Alternative PHP Cache, is a framework used for caching the compiled source code of a script app, that can boost a database-driven website several times. Any time a PHP page is accessed, the script pulls the website content that has to be loaded from a database, parses and compiles the code, and the result is shown to the site visitor. While this is necessary for websites with frequently changing content, it's a waste of processing time and system resources for an Internet site 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 whenever a user opens them. Since this saves the time to request content from the database and to parse and compile the code, the Internet site will load considerably faster. APC is really effective in particular for scripts with massive source code.