Drupal is an open-source content management system (CMS) for building and managing websites and applications. It's known for its flexibility and scalability, supporting various sites from blogs to enterprise-level applications. Drupal.orgis the official site for downloading Drupal, accessing documentation, joining the community, and finding resources for developers, marketers, and content creators. It's used by organizations worldwide, including universities, governments, and media companies, for its robust features and community support.