A content management system, often abbreviated as CMS, is software that helps user to create, manage and help host websites without the need to write code in HTML and CSS.
Content management application (CMA) provides the functionalities to customize the web page for user needs and the Content delivery application (CDA)handles all the website management jobs like storing the pages, posts, and images and publishing the pages with versions and timestamps.
CMS is useful for building static websites, blogs, eCommerce stores, forums, etc. But it’s not suitable for dynamic web application use cases like Facebook.
There are a lot of CMS in the market. The most popular one is WordPress. The other popular ones are Joomla, Drupal, Wix, etc.
References
What Is a Content Management System (CMS)? Kinsta. Updated Dec 13, 2022, https://kinsta.com/knowledgebase/content-management-system/