Alternative PHP Cache, or APC, is a module for Apache web servers that is employed to cache the output code of script applications. It is very efficient for scripts with large source code and could accelerate such a site as much as 3 times. PHP sites are dynamic and whenever a website visitor accesses some page, the script hooks up to a database in order to retrieve some content, and then the code is parsed and compiled prior to it being displayed to the website visitor. In case the output code does not change however, that is the case with Internet sites that show identical content at all times, such actions result in unneeded reading and writing. What APC does is that it caches the previously compiled code and delivers it whenever visitors browse a site, so the database does not have to be accessed and the program code doesn't need to be parsed and compiled repeatedly, which in turn decreases the site loading time. The module could be pretty useful for informational Internet sites, blogs, portfolios, and many others.