The document introduces 'Rain', a new CMS built for Drupal 9 that aims to streamline website creation and management for IT professionals and marketers, boasting benefits like faster MVP deployment and improved authoring experience. It emphasizes Rain's advantages over Drupal core, including a more intuitive admin interface, pre-configured modules, and rapid project launches as demonstrated in case studies. The content highlights the open-source ethos of empowering users while providing tangible savings in time and resources when using Rain.