This document provides an overview of Drupal for developers familiar with Symfony. It describes Drupal as a PHP content management framework that is highly customizable. It highlights key Drupal features like security, performance, and multilingual support. The document reviews Drupal versions, the installation and content structure, and the user interface. It provides examples of Drupal code like routing, services, events and the use of Symfony components. Finally, it discusses the Drupal community and support resources available.