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 could speed up such an Internet site up to 3 times. PHP sites are dynamic and any time a website visitor opens a webpage, the script connects to a database in order to get some content, and then the code is parsed and compiled before it's displayed to the visitor. In case the output code does not change however, which is the case with websites which display the same content all the time, these actions result in excessive reading and writing. What APC does is that it caches the already compiled program code and delivers it any time visitors browse a site, so the database does not have to be accessed and the code doesn't have to be parsed and compiled over and over again, that consequently reduces the website loading time. The module could be pretty helpful for informational websites, blogs, portfolios, and so on.