Alternative PHP Cache, or APC, is a module for Apache servers which is employed to cache the output code of script applications. It is very effective for scripts with large source code and can accelerate such an Internet site up to 3 times. PHP sites are dynamic and every time a website visitor accesses a page, the script connects to a database to retrieve some content, then the code is parsed and compiled before it's displayed to the website visitor. If the output code does not change however, that is the case with sites which show the exact same content all of the time, these actions result in needless reading and writing. What APC does is that it caches the already compiled code and delivers it each time visitors browse an Internet site, so the database does not have to be accessed and the code does not need to be parsed and compiled over and over again, which in turn reduces the website loading time. The module could be rather useful for informational sites, blogs, portfolios, etc.