Drupal is a powerful content management system that allows users to create complex, multi-user blogs and websites with user-generated content. It has over 2000 contributed modules and 250 themes that provide additional functionality like forums, search, localization, caching, and statistics. While Drupal is powerful and configurable, it also has a learning curve and requires configuration to meet specific needs beyond basic blogging. Basic requirements are a web server like Apache, PHP, and a database like MySQL.