A CMS (Content Management System) is software that makes it easy to create, edit, and manage website content without needing to code everything from scratch. It provides a user-friendly interface for publishing pages, organizing media, and customizing layouts, while still allowing developers to extend functionality through themes, plugins, or custom code. Popular CMS platforms like WordPress, Drupal, and Joomla power many of the world’s websites because they simplify content management while keeping sites flexible and scalable.