Simply put, a Content Management System, or CMS, is a web page creation/publishing/promotional set of tools designed to be easy for non-technical users.
The basic principle is simple: Separate the container from the content.
That means, keep the look, layout and functional attributes separate from the text, images and other media that delivers the information.
A CMS separates the style from the substance, and allows the content creator to get on with presenting information without getting bogged down in the delivery method.
Modern, well CMS, such as WordPress,