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 useful for scripts with large source code and will boost such a site up to three times. PHP sites are dynamic and every time a website visitor opens a page, the script hooks up to a database to retrieve some content, and then the code is parsed and compiled before it is shown to the visitor. In case the output code doesn't change however, that's the case with sites that show the very same content at all times, these actions result in unnecessary reading and writing. What APC does is that it caches the previously compiled program code and delivers it each time visitors browse an Internet site, 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 in turn reduces the website loading time. The module could be really effective for informational sites, blogs, portfolios, etc.