CMS stands for Content Management System. It is a software application that allows users to create, manage, and publish digital content on websites without needing extensive technical expertise. Some popular CMS platforms used in web design include:

• WordPress - A flexible and user-friendly CMS for building blogs, websites, and web applications
• Drupal - A powerful, scalable CMS suitable for complex, enterprise-level websites
• Joomla - A versatile CMS with a wide range of extensions and customization options
• Squarespace - A drag-and-drop website builder and CMS for creating visually appealing websites
• Magento - A CMS focused on e-commerce and building online stores

The main benefits of using a CMS in web design include easier content management, improved website administration, and the ability to create dynamic, database-driven websites with minimal coding.