The primary use of a content management system (CMS) is to enable users to create, manage, and modify digital content without requiring specialized technical skills. It simplifies the process of website management by providing user-friendly interfaces for content creation, editing, and organization. CMS platforms like WordPress and Joomla also support features such as SEO optimization, analytics, and plugins for enhanced functionality, making them crucial for businesses aiming to maintain an online presence and engage with customers effectively.