A content management system (CMS) allows management of website content throughout its lifecycle. A CMS has two main elements - a content management application to create and edit content, and a content delivery application to display published content on templates. Popular CMS platforms include Joomla, Drupal, and WordPress. CMS systems separate content from presentation by storing content in a database and placing it into templates. They provide functionality for content creation, management, publishing, and presentation without requiring technical skills. CMS makes it easier to manage large websites and reuse content securely while saving time and money compared to manually coding and updating websites. Selecting the right CMS depends on a website's specific requirements.