APC, which is an acronym for Alternative PHP Cache, is a framework used for caching the compiled source code of a script application, which can speed up a database-driven website several times. Each time a PHP webpage is opened, the script pulls the site content which should be displayed from a database, parses and compiles the code, and then the result is displayed to the website visitor. While this is necessary for websites with constantly changing content, it is a waste of processing time and resources for a site that does not change, such as an informational portal which shows the exact same content at all times. Once the webpages for such a website are compiled, APC caches them and delivers them any time a visitor opens them. Since this saves the time to get content from the database and to parse and compile the program code, the website will load much quicker. APC is very useful especially for scripts with larger source code.