Drupal is an open source content management system powering millions of websites. It allows for flexible and powerful website creation through modules that expand its capabilities. Drupal provides tools for creating, managing, and organizing content including taxonomies, menus, blocks, and custom content types through modules like Views and CCK. Installation and use of Drupal involves obtaining XAMPP, installing Drupal 7, and learning how to configure modules, themes, users, and content.