A Content Management System (CMS) is a software application that enables individuals or organizations to create, manage, and publish digital content on the internet without requiring advanced technical knowledge. It provides a user-friendly interface for content creation and editing, allowing users to organize and structure their content effectively. A CMS is necessary because it simplifies the process of website management, allowing multiple users to collaborate, maintain consistency in design and branding, and streamline content updates. It enables efficient content publishing, facilitates version control, and ensures a seamless user experience by separating content from the underlying technical aspects of a website, making it easier to maintain and update content regularly.