Alternative PHP Cache, or APC, is a module for Apache web servers which is used to cache the output code of script applications. It is very useful for scripts with large source code and will speed up such an Internet site as much as 3 times. PHP websites are dynamic and any time a website visitor opens some page, the script links to a database in order to get some content, then the code is parsed and compiled before it is displayed to the site visitor. In case the output code does not change however, that is the case with websites which display identical content at all times, such actions trigger needless reading and writing. What APC does is that it caches the already compiled code and delivers it each time visitors browse a website, so the database does not have to be accessed and the code doesn't need to be parsed and compiled again and again, which in turn reduces the site loading time. The module could be very helpful for informational Internet sites, blogs, portfolios, etc.