APC, which is an acronym for Alternative PHP Cache, is a framework used for caching the compiled source code of a given script app, that could boost a database-driven website several times. When a PHP page is opened, the script pulls the site content that should be displayed from a database, parses and compiles the code, and the result is displayed to the visitor. While this is necessary for Internet sites with frequently changing content, it is a total waste of processing time and resources for an Internet site which does not change, such as an informational portal that displays the exact same content all the time. As soon as the pages for such a site are compiled, APC caches them and delivers them any time a visitor loads them. As this saves the time to obtain content from the database and to parse and compile the code, the Internet site will load considerably quicker. APC is very useful particularly for scripts with larger source code.