Alternative PHP Cache, or APC, is a module for Apache servers that is used 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 3 times. PHP websites are dynamic and each time a user opens some web page, the script connects to a database to get some content, after that the code is parsed and compiled before it's displayed to the visitor. In case the output code doesn't change however, which is the case with Internet sites that display identical content all of the time, these actions result in excessive reading and writing. What APC does is that it caches the previously compiled program code and delivers it any time visitors browse a website, so the database doesn't need to be accessed and the program code does not have to be parsed and compiled again and again, that consequently lowers the Internet site loading time. The module can be pretty effective for informational sites, blogs, portfolios, and many others.