PHP

It was among the first languages that could be embedded in HTML documents, often eliminating the need for external files for data processing. The code is interpreted server-side by the PHP module, which also generates the web page to be displayed on the client side.

Over time, the language evolved to include command-line functionalities and gained additional features, enabling PHP to be used beyond websites. PHP can be installed on most operating systems for free.

As a direct competitor to Microsoft’s ASP technology, PHP is used in applications such as MediaWiki, Facebook, Drupal, Joomla!, WordPress, Magento, and Oscommerce.