APC, which is short for Alternative PHP Cache, is a framework used for caching the compiled source code of a given script app, that can boost a database-driven site several times. When a PHP webpage is opened, the script pulls the website content that needs to be loaded from a database, parses and compiles the program code, and the result is shown to the website visitor. While this is necessary for websites with routinely changing content, it is a waste of processing time and system resources for an Internet site that does not change, for example an informational portal which shows the same content all the time. When the pages for such an Internet site are compiled, APC caches them and delivers them any time a user loads them. Since this saves the time to request content from the database and to parse and compile the program code, your Internet site will load considerably quicker. APC is really efficient especially for scripts with large source code.