Alternative PHP Cache, or APC, is a module for Apache servers which is used to cache the output code of script applications. It is very useful for scripts with large source code and will accelerate such a site as much as 3 times. PHP websites are dynamic and whenever a visitor opens a webpage, the script hooks up to a database to retrieve some content, and then the code is parsed and compiled prior to it being displayed to the guest. If the output code doesn't change however, that's the case with sites which display the same content all of the time, these actions result in unnecessary reading and writing. What APC does is that it caches the previously compiled code and delivers it every time visitors browse a site, so the database doesn't have to be accessed and the program code does not need to be parsed and compiled repeatedly, that consequently lowers the Internet site loading time. The module could be extremely effective for informational Internet sites, blogs, portfolios, etc.