- Drupal is an open source content management system (CMS) written in PHP that allows users to build sophisticated web applications and websites. - It has a modular architecture that can be extended through modules and themes. Core functionality can be added and customized through contributed modules and themes available on Drupal.org. - Content in Drupal is managed through nodes, which are the basic building blocks. Different types of nodes like pages, articles can be created. Non-node elements include users, taxonomy, and blocks. - The document provides an overview of Drupal's system requirements, basic structure and components, and outlines the initial site building process for setting up the site and adding users and roles.

1. An Introduction to Drupal An overview of the architecture, features and basic site-building workflow of the CMS. By Vipulika Sharma

18. Most Useful Contributed Modules Administration menu CCK Views String Overrides Backup and Migrate SEO Checklist SEO Compliance Checker Pathauto Path Redirect Global Redirect Search404 Meta Tags Global GEOurl Html Purifier Page Title Menu Attributes New XML Sitemap Site Map Taxonomy Manager Token Auto Assign Role (+patch) Ubercart Date Mollum / Spam Captcha WYSIWYG API FCKEditor IMCE Chaos Tools + Delegator Panels Actions Triggers Notify Scheduler Addthis / Diggthis/ Sharethis Guestbook Simplenews GoogAnalytics