Drupal 6 is an open-source content management system (CMS) released in February 2008. It allows users to create and manage websites easily, offering a flexible framework for building various types of online platforms, from blogs to complex enterprise sites. This version introduced several improvements over its predecessor, including enhanced performance, better user interface, and improved support for custom themes and modules. Although it has been succeeded by newer versions, Drupal 6 played a significant role in the evolution of web development and remains a reference point for many developers.