Alternative PHP Cache, or APC, is a module for Apache servers that is employed to cache the output code of script apps. It is very efficient for scripts with large source code and could speed up such an Internet site up to three times. PHP sites are dynamic and each time a website visitor accesses a page, the script links to a database to retrieve some content, after that the code is parsed and compiled prior to it being displayed to the visitor. If the output code does not change however, that is the case with websites that display the same content all of the time, these actions trigger excessive reading and writing. What APC does is that it caches the previously compiled code and delivers it each time visitors browse a site, so the database doesn't need to be accessed and the program code does not have to be parsed and compiled repeatedly, that consequently lowers the site loading time. The module could be really efficient for informational sites, blogs, portfolios, and so on.