Drupal is an open source content management system (CMS) that allows non-technical users to manage and publish content through an administrative interface instead of code. It has over 800 core contributors and is built on a stack that includes Linux, Apache, MySQL, and PHP. Drupal provides core functionality and modules that can be customized through different template engines and themes. Examples of sites built with Drupal include Bookmans, Sony Music Artists, and the New York Observer. Resources for learning more include the Drupal website, local Drupal user groups, books, and the author's contact information for questions.