APC, which means Alternative PHP Cache, is a framework used for caching the compiled source code of a given script application, that could speed up a database-driven Internet site several times. Any time a PHP webpage is opened, the script pulls the website content which should be loaded from a database, parses and compiles the code, and then the result is displayed to the site visitor. While this is necessary for Internet sites with frequently changing content, it is a waste of processing time and resources for a website which does not change, such as an informational portal which displays identical content all the time. When the pages for such an Internet site are compiled, APC caches them and delivers them each time a visitor opens them. Since this saves the time to obtain content from the database and to parse and compile the program code, your website will load a lot quicker. APC is very efficient especially for scripts with massive source code.