A content management system, or CMS, is a web application designed to make it easy for non-technical users to add, edit and manage a website.
Not only do content management systems help website users with content editing, they also take care of a lot of "behind the scenes" work such as:
• Automatically generate navigation elements
• Making content searchable and indexable
• Keeping track of users, their permissions and security settings
• And much, much more.